| ( | - | 1 100 | ( | 1500 | − | x | ) | + | 100 | ) | = | ( | - | 1 100 | ( | 1000 | + | x | ) | + | 100 | ) |
| Left side of the equation = | - | 1 100 | ( | 1500 | − | x | ) | + | 100 |
| = | - | 1 100 | × | 1500 | + | 1 100 | x | + | 100 |
| = | - | 15 | + | 1 100 | x | + | 100 |
| = | 85 | + | 1 100 | x |
| 85 | + | 1 100 | x | = | ( | - | 1 100 | ( | 1000 | + | x | ) | + | 100 | ) |
| Right side of the equation = | - | 1 100 | ( | 1000 | + | x | ) | + | 100 |
| = | - | 1 100 | × | 1000 | − | 1 100 | x | + | 100 |
| = | - | 10 | − | 1 100 | x | + | 100 |
| = | 90 | − | 1 100 | x |
| 85 | + | 1 100 | x | = | 90 | − | 1 100 | x |
1 100 | x | + | 1 100 | x | = | 90 | − | 85 |
1 50 | x | = | 90 | − | 85 |
1 50 | x | = | 5 |
| x | = | 5 | ÷ | 1 50 |
| = | 5 | × | 50 |
| x | = | 250 |