| 10 | ÷ | ( | x | − | 1 | ) | − | ( | 1001 | x | − | 1001 | ) | ÷ | ( | 90 | x | ) | + | 21 10 | = | 0 |
| Multiply both sides of the equation by: | ( | x | − | 1 | ) |
| 10 | − | ( | 1001 | x | − | 1001 | ) | ÷ | ( | 90 | x | ) | × | ( | x | − | 1 | ) | + | 21 10 | ( | x | − | 1 | ) | = | 0 |
| 10 | − | 1001 | x | ÷ | ( | 90 | x | ) | × | ( | x | − | 1 | ) | + | 1001 | ÷ | ( | 90 | x | ) | × | ( | x | − | 1 | ) | + | 21 10 | ( | x | − | 1 | ) | = | 0 |
| Multiply both sides of the equation by: | ( | 90 | × | 1 | ) |
| 10 | ( | 90 | × | 1 | ) | − | 1001 | × | 1 | ( | x | − | 1 | ) | + | 1001 | ÷ | ( | 90 | x | ) | × | ( | x | − | 1 | ) | ( | 90 | × | 1 | ) | + | 21 10 | ( | x | − | 1 | ) | ( | 90 | × | 1 | ) | = | 0 |
| 10 | × | 90 | × | 1 | − | 1001 | × | 1 | ( | x | − | 1 | ) | + | 1001 | ÷ | ( | 90 | x | ) | × | ( | x | − | 1 | ) | ( | 90 | × | 1 | ) | + | 21 10 | ( | x | − | 1 | ) | = | 0 |
| 900 | − | 1001 | ( | x | − | 1 | ) | + | 1001 | ÷ | ( | 90 | x | ) | × | ( | x | − | 1 | ) | ( | 90 | × | 1 | ) | + | 21 10 | ( | x | − | 1 | ) | ( | 90 | × | 1 | ) | = | 0 |
| Multiply both sides of the equation by: | ( | 90 | x | ) |
| 900 | ( | 90 | x | ) | − | 1001 | ( | x | − | 1 | ) | ( | 90 | x | ) | + | 1001 | ( | x | − | 1 | ) | ( | 90 | × | 1 | ) | + | 21 10 | ( | x | − | 1 | ) | ( | 90 | × | 1 | ) | ( | 90 | x | ) | = | 0 |
| 900 | × | 90 | x | − | 1001 | ( | x | − | 1 | ) | ( | 90 | x | ) | + | 1001 | ( | x | − | 1 | ) | ( | 90 | × | 1 | ) | + | 21 10 | ( | x | − | 1 | ) | ( | 90 | × | 1 | ) | = | 0 |
| 81000 | x | − | 1001 | ( | x | − | 1 | ) | ( | 90 | x | ) | + | 1001 | ( | x | − | 1 | ) | ( | 90 | × | 1 | ) | + | 21 10 | ( | x | − | 1 | ) | ( | 90 | × | 1 | ) | ( | 90 | x | ) | = | 0 |
| 81000 | x | − | 1001 | x | ( | 90 | x | ) | + | 1001 | × | 1 | ( | 90 | x | ) | + | 1001 | ( | x | − | 1 | ) | ( | 90 | × | 1 | ) | + | 21 10 | = | 0 |
| 81000 | x | − | 1001 | x | ( | 90 | x | ) | + | 1001 | ( | 90 | x | ) | + | 1001 | ( | x | − | 1 | ) | ( | 90 | × | 1 | ) | + | 21 10 | ( | x | − | 1 | ) | = | 0 |
| 81000 | x | − | 1001 | x | × | 90 | x | + | 1001 | ( | 90 | x | ) | + | 1001 | ( | x | − | 1 | ) | ( | 90 | × | 1 | ) | + | 21 10 | = | 0 |
| 81000 | x | − | 90090 | x | x | + | 1001 | ( | 90 | x | ) | + | 1001 | ( | x | − | 1 | ) | ( | 90 | × | 1 | ) | + | 21 10 | ( | x | − | 1 | ) | = | 0 |
| 81000 | x | − | 90090 | x | x | + | 1001 | × | 90 | x | + | 1001 | ( | x | − | 1 | ) | ( | 90 | × | 1 | ) | + | 21 10 | = | 0 |
| 81000 | x | − | 90090 | x | x | + | 90090 | x | + | 1001 | ( | x | − | 1 | ) | ( | 90 | × | 1 | ) | + | 21 10 | ( | x | − | 1 | ) | = | 0 |
| 171090 | x | − | 90090 | x | x | + | 1001 | ( | x | − | 1 | ) | ( | 90 | × | 1 | ) | + | 21 10 | ( | x | − | 1 | ) | ( | 90 | × | 1 | ) | ( | 90 | x | ) | = | 0 |
| 171090 | x | − | 90090 | x | x | + | 1001 | x | ( | 90 | × | 1 | ) | − | 1001 | × | 1 | ( | 90 | × | 1 | ) | + | 21 10 | = | 0 |
| 171090 | x | − | 90090 | x | x | + | 1001 | x | ( | 90 | × | 1 | ) | − | 1001 | ( | 90 | × | 1 | ) | + | 21 10 | ( | x | − | 1 | ) | = | 0 |
| 171090 | x | − | 90090 | x | x | + | 1001 | x | × | 90 | × | 1 | − | 1001 | ( | 90 | × | 1 | ) | + | 21 10 | = | 0 |
| 171090 | x | − | 90090 | x | x | + | 90090 | x | − | 1001 | ( | 90 | × | 1 | ) | + | 21 10 | ( | x | − | 1 | ) | ( | 90 | × | 1 | ) | = | 0 |
| 261180 | x | − | 90090 | x | x | − | 1001 | ( | 90 | × | 1 | ) | + | 21 10 | ( | x | − | 1 | ) | ( | 90 | × | 1 | ) | ( | 90 | x | ) | = | 0 |
| 261180 | x | − | 90090 | x | x | − | 1001 | × | 90 | × | 1 | + | 21 10 | ( | x | − | 1 | ) | ( | 90 | × | 1 | ) | ( | 90 | x | ) | = | 0 |
| 261180 | x | − | 90090 | x | x | − | 90090 | + | 21 10 | ( | x | − | 1 | ) | ( | 90 | × | 1 | ) | ( | 90 | x | ) | = | 0 |