| x | = | - | 100 | + | 1 5 | ( | x | − | 250 | + | 125 2 | ) | + | 250 |
| 方程右边 = | 150 | + | 1 5 | ( | x | − | 250 | + | 125 2 | ) |
| x | = | 150 | + | 1 5 | ( | x | − | 250 | + | 125 2 | ) |
| 方程右边 = | 150 | + | 1 5 | x | − | 1 5 | × | 250 | + | 1 5 | × | 125 2 |
| = | 150 | + | 1 5 | x | − | 50 | + | 25 2 |
| = | 225 2 | + | 1 5 | x |
| x | = | 225 2 | + | 1 5 | x |
| x | − | 1 5 | x | = | 225 2 |
4 5 | x | = | 225 2 |
| x | = | 225 2 | ÷ | 4 5 |
| = | 225 2 | × | 5 4 |
| x | = | 1125 8 |
| x | = | 140.625 |