| ( | x | − | 615 | ) | × | 3 4 | − | 240 | = | ( | x | − | 375 | ) | × | 3 4 | ÷ | 3 2 | − | 240 | ÷ | 3 2 |
| 方程左边 = | x | × | 3 4 | − | 615 | × | 3 4 | − | 240 |
| = | x | × | 3 4 | − | 1845 4 | − | 240 |
| = | 3 4 | x | − | 2805 4 |
3 4 | x | − | 2805 4 | = | ( | x | − | 375 | ) | × | 3 4 | ÷ | 3 2 | − | 240 | ÷ | 3 2 |
| 方程右边 = | ( | x | − | 375 | ) | × | 1 2 | − | 160 |
3 4 | x | − | 2805 4 | = | ( | x | − | 375 | ) | × | 1 2 | − | 160 |
| 方程右边 = | x | × | 1 2 | − | 375 | × | 1 2 | − | 160 |
| = | x | × | 1 2 | − | 375 2 | − | 160 |
| = | 1 2 | x | − | 695 2 |
3 4 | x | − | 2805 4 | = | 1 2 | x | − | 695 2 |
3 4 | x | − | 1 2 | x | = | - | 695 2 | + | 2805 4 |
1 4 | x | = | - | 695 2 | + | 2805 4 |
1 4 | x | = | 1415 4 |
| x | = | 1415 4 | ÷ | 1 4 |
| = | 1415 4 | × | 4 |
| = | 1415 | × | 1 |
| x | = | 1415 |