| ( | x | − | 320 | ) | ÷ | 57 | = | ( | x | − | 383 | ) | ÷ | 50 |
| 方程左边 = | x | × | 1 57 | − | 320 | × | 1 57 |
| = | x | × | 1 57 | − | 320 57 |
1 57 | x | − | 320 57 | = | ( | x | − | 383 | ) | ÷ | 50 |
| 方程右边 = | x | × | 1 50 | − | 383 | × | 1 50 |
| = | x | × | 1 50 | − | 383 50 |
1 57 | x | − | 320 57 | = | 1 50 | x | − | 383 50 |
1 57 | x | − | 1 50 | x | = | - | 383 50 | + | 320 57 |
| - | 7 2850 | x | = | - | 383 50 | + | 320 57 |
| - | 7 2850 | x | = | - | 5831 2850 |
5831 2850 | = | 7 2850 | x |
7 2850 | x | = | 5831 2850 |
| x | = | 5831 2850 | ÷ | 7 2850 |
| = | 5831 2850 | × | 2850 7 |
| = | 833 | × | 1 |
| x | = | 833 |