| 45 | ÷ | 111 | − | 1 5 | = | 57 20000 | ( | 145 | + | X | ) |
| 方程左边 = | 15 37 | − | 1 5 |
| = | 38 185 |
38 185 | = | 57 20000 | ( | 145 | + | X | ) |
| 方程右边 = | 57 20000 | × | 145 | + | 57 20000 | X |
| = | 1653 4000 | + | 57 20000 | X |
38 185 | = | 1653 4000 | + | 57 20000 | X |
| - | 57 20000 | X | = | 1653 4000 | − | 38 185 |
| - | 57 20000 | X | = | 30761 148000 |
| - | 30761 148000 | = | 57 20000 | X |
57 20000 | X | = | - | 30761 148000 |
| X | = | - | 30761 148000 | ÷ | 57 20000 |
| = | - | 30761 148000 | × | 20000 57 |
| = | - | 1619 37 | × | 5 3 |
| X | = | - | 8095 111 |
| X | = | - 72.927928 |