| ( | 521 | − | x | ) | ÷ | 74 | = | ( | 374 | − | 2 | x | ) | ÷ | 55 |
| 方程左边 = | 521 | × | 1 74 | − | x | × | 1 74 |
| = | 521 74 | − | x | × | 1 74 |
521 74 | − | 1 74 | x | = | ( | 374 | − | 2 | x | ) | ÷ | 55 |
| 方程右边 = | 374 | × | 1 55 | − | 2 | x | × | 1 55 |
| = | 34 5 | − | 2 55 | x |
521 74 | − | 1 74 | x | = | 34 5 | − | 2 55 | x |
| - | 1 74 | x | + | 2 55 | x | = | 34 5 | − | 521 74 |
93 4070 | x | = | 34 5 | − | 521 74 |
93 4070 | x | = | - | 89 370 |
| x | = | - | 89 370 | ÷ | 93 4070 |
| = | - | 89 370 | × | 4070 93 |
| = | - | 89 | × | 11 93 |
| x | = | - | 979 93 |
| x | = | - 10.526882 |