| ( | ( | 260 | − | x | ) | ÷ | 10 | × | 15 2 | ) | ( | x | − | 100 | ) | = | 9000 |
| 方程左边 = | ( | 260 | − | x | ) | ÷ | 10 | × | 15 2 | ( | x | − | 100 | ) |
| = | ( | 260 | − | x | ) | × | 3 4 | ( | x | − | 100 | ) |
| = | 260 | × | 3 4 | ( | x | − | 100 | ) | − | x | × | 3 4 | ( | x | − | 100 | ) |
| = | 195 | ( | x | − | 100 | ) | − | x | × | 3 4 | ( | x | − | 100 | ) |
| = | 195 | x | − | 195 | × | 100 | − | x | × | 3 4 | ( | x | − | 100 | ) |
| = | 195 | x | − | 19500 | − | x | × | 3 4 | ( | x | − | 100 | ) |
| = | 195 | x | − | 19500 | − | x | × | 3 4 | x | + | x | × | 3 4 | × | 100 |
| = | 195 | x | − | 19500 | − | x | × | 3 4 | x | + | x | × | 75 |
| = | 270 | x | − | 19500 | − | x | × | 3 4 | x |
| 270 | x | − | 19500 | − | x | × | 3 4 | x | = | 9000 |