74 500 | = | ( | X | − | 69 1000 | ) | × | 87 50 | × | 100 |
| 方程右边 = | ( | X | − | 69 1000 | ) | × | 174 |
74 500 | = | ( | X | − | 69 1000 | ) | × | 174 |
| 方程右边 = | X | × | 174 | − | 69 1000 | × | 174 |
| = | X | × | 174 | − | 6003 500 |
74 500 | = | 174 | X | − | 6003 500 |
| - | 174 | X | = | - | 6003 500 | − | 74 500 |
| - | 174 | X | = | - | 6077 500 |
6077 500 | = | 174 | X |
| 174 | X | = | 6077 500 |
| X | = | 6077 500 | ÷ | 174 |
| = | 6077 500 | × | 1 174 |
| X | = | 6077 87000 |
| X | = | 0.069851 |