| ( | x | − | 200 | ) | ÷ | 200 | × | 100 100 | = | 10 100 |
| Left side of the equation = | ( | x | − | 200 | ) | × | 1 200 |
| ( | x | − | 200 | ) | × | 1 200 | = | 10 100 |
| Left side of the equation = | x | × | 1 200 | − | 200 | × | 1 200 |
| = | x | × | 1 200 | − | 1 |
1 200 | x | − | 1 | = | 10 100 |
1 200 | x | = | 10 100 | + | 1 |
1 200 | x | = | 11 10 |
| x | = | 11 10 | ÷ | 1 200 |
| = | 11 10 | × | 200 |
| = | 11 | × | 20 |
| x | = | 220 |