| ( | 220 | × | 2 | × | 37 | − | X | ) | × | 9 10 | = | 804217 50 |
| 方程左边 = | 220 | × | 2 | × | 37 | × | 9 10 | − | X | × | 9 10 |
| = | 14652 | − | X | × | 9 10 |
| 14652 | − | 9 10 | X | = | 804217 50 |
| - | 9 10 | X | = | 804217 50 | − | 14652 |
| - | 9 10 | X | = | 71617 50 |
| - | 71617 50 | = | 9 10 | X |
9 10 | X | = | - | 71617 50 |
| X | = | - | 71617 50 | ÷ | 9 10 |
| = | - | 71617 50 | × | 10 9 |
| = | - | 71617 5 | × | 1 9 |
| X | = | - | 71617 45 |
| X | = | - 1591.488889 |