| ( | 24 | − | X | ) | ÷ | 24 | = | ( | 20 | − | X | ) | ÷ | 5 |
| 方程左边 = | 24 | × | 1 24 | − | X | × | 1 24 |
| = | 1 | − | X | × | 1 24 |
| 1 | − | 1 24 | X | = | ( | 20 | − | X | ) | ÷ | 5 |
| 方程右边 = | 20 | × | 1 5 | − | X | × | 1 5 |
| = | 4 | − | X | × | 1 5 |
| 1 | − | 1 24 | X | = | 4 | − | 1 5 | X |
| - | 1 24 | X | + | 1 5 | X | = | 4 | − | 1 |
19 120 | X | = | 4 | − | 1 |
19 120 | X | = | 3 |
| X | = | 3 | ÷ | 19 120 |
| = | 3 | × | 120 19 |
| X | = | 360 19 |
| X | = | 18.947368 |