| ( | 2973 50 | − | X | ) | ÷ | 750 | = | X | ÷ | 700 |
| 方程左边 = | 2973 50 | × | 1 750 | − | X | × | 1 750 |
| = | 991 12500 | − | X | × | 1 750 |
991 12500 | − | 1 750 | X | = | X | ÷ | 700 |
| - | 1 750 | X | − | 1 700 | X | = | - | 991 12500 |
| - | 29 10500 | X | = | - | 991 12500 |
991 12500 | = | 29 10500 | X |
29 10500 | X | = | 991 12500 |
| X | = | 991 12500 | ÷ | 29 10500 |
| = | 991 12500 | × | 10500 29 |
| = | 991 25 | × | 21 29 |
| X | = | 20811 725 |
| X | = | 28.704828 |