| ( | 2 5 | X | − | 3435 | ) | ÷ | 500 | = | ( | 2 5 | X | − | 3195 | ) | ÷ | 750 |
| 方程左边 = | 2 5 | X | × | 1 500 | − | 3435 | × | 1 500 |
| = | 1 1250 | X | − | 687 100 |
1 1250 | X | − | 687 100 | = | ( | 2 5 | X | − | 3195 | ) | ÷ | 750 |
| 方程右边 = | 2 5 | X | × | 1 750 | − | 3195 | × | 1 750 |
| = | 1 1875 | X | − | 213 50 |
1 1250 | X | − | 687 100 | = | 1 1875 | X | − | 213 50 |
1 1250 | X | − | 1 1875 | X | = | - | 213 50 | + | 687 100 |
1 3750 | X | = | - | 213 50 | + | 687 100 |
1 3750 | X | = | 261 100 |
| X | = | 261 100 | ÷ | 1 3750 |
| = | 261 100 | × | 3750 |
| = | 261 2 | × | 75 |
| X | = | 19575 2 |
| X | = | 9787.5 |