| 644 | ÷ | x | − | 150 | + | 72 | ÷ | 25 | = | 944 | ÷ | x |
| 方程两边同时乘以: | x |
| 644 | − | 150 | x | + | 72 | ÷ | 25 | × | x | = | 944 | ÷ | 1 | × | 1 |
| - | 150 | x | + | 72 | ÷ | 25 | × | x | = | 944 | ÷ | 1 | × | 1 | − | 644 |
| - | 150 | x | + | 72 25 | x | = | 944 | ÷ | 1 | × | 1 | − | 644 |
| - | 150 | x | + | 72 25 | x | = | 944 | − | 644 |
| - | 3678 25 | x | = | 944 | − | 644 |
| - | 3678 25 | x | = | 300 |
| - | 300 | = | 3678 25 | x |
3678 25 | x | = | - | 300 |
| x | = | - | 300 | ÷ | 3678 25 |
| = | - | 300 | × | 25 3678 |
| = | - | 50 | × | 25 613 |
| x | = | - | 1250 613 |
| x | = | - 2.039152 |