| ( | 621 5 | + | 59 | ) | − | 57 100 | x | − | 29 100 | ( | 330 | − | x | ) | = | 109 2 |
| 方程左边 = | 621 5 | + | 59 | − | 57 100 | x | − | 29 100 | ( | 330 | − | x | ) |
| = | 916 5 | − | 57 100 | x | − | 29 100 | ( | 330 | − | x | ) |
| = | 916 5 | − | 57 100 | x | − | 29 100 | × | 330 | + | 29 100 | x |
| = | 916 5 | − | 57 100 | x | − | 957 10 | + | 29 100 | x |
| = | 175 2 | − | 7 25 | x |
175 2 | − | 7 25 | x | = | 109 2 |
| - | 7 25 | x | = | 109 2 | − | 175 2 |
| - | 7 25 | x | = | - | 33 |
| 33 | = | 7 25 | x |
7 25 | x | = | 33 |
| x | = | 33 | ÷ | 7 25 |
| = | 33 | × | 25 7 |
| x | = | 825 7 |
| x | = | 117.857143 |