| 12 | ÷ | ( | 12 | + | x | ) | − | 10 | ÷ | ( | 10 | + | x | ) | = | 3 20 |
| Multiply both sides of the equation by: | ( | 12 | + | x | ) |
| 12 | − | 10 | ÷ | ( | 10 | + | x | ) | × | ( | 12 | + | x | ) | = | 3 20 | ( | 12 | + | x | ) |
| 12 | − | 10 | ÷ | ( | 10 | + | x | ) | × | 12 | − | 10 | ÷ | ( | 10 | + | x | ) | × | x | = | 3 20 | ( | 12 | + | x | ) |
| 12 | − | 10 | ÷ | ( | 10 | + | x | ) | × | 12 | − | 10 | ÷ | ( | 10 | + | x | ) | × | x | = | 3 20 | × | 12 | + | 3 20 | x |
| 12 | − | 120 | ÷ | ( | 10 | + | x | ) | − | 10 | ÷ | ( | 10 | + | x | ) | × | x | = | 9 5 | + | 3 20 | x |
| Multiply both sides of the equation by: | ( | 10 | + | x | ) |
| 12 | ( | 10 | + | x | ) | − | 120 | − | 10 | x | = | 9 5 | ( | 10 | + | x | ) | + | 3 20 | x | ( | 10 | + | x | ) |
| 12 | × | 10 | + | 12 | x | − | 120 | − | 10 | x | = | 9 5 | ( | 10 | + | x | ) | + | 3 20 | x | ( | 10 | + | x | ) |
| 12 | × | 10 | + | 12 | x | − | 120 | − | 10 | x | = | 9 5 | × | 10 | + | 9 5 | x | + | 3 20 | x | ( | 10 | + | x | ) |
| 120 | + | 12 | x | − | 120 | − | 10 | x | = | 18 | + | 9 5 | x | + | 3 20 | x | ( | 10 | + | x | ) |
| 0 | + | 2 | x | = | 18 | + | 9 5 | x | + | 3 20 | x | ( | 10 | + | x | ) |
| 2 | x | = | 18 | + | 9 5 | x | + | 3 20 | x | × | 10 | + | 3 20 | x | x |
| 2 | x | = | 18 | + | 9 5 | x | + | 3 2 | x | + | 3 20 | x | x |
| 2 | x | = | 18 | + | 33 10 | x | + | 3 20 | x | x |