| ( | 621 5 | + | 59 | ) | − | 57 100 | x | − | 29 100 | x | = | 109 2 |
| 方程左边 = | ( | 621 5 | + | 59 | ) | − | 43 50 | x |
| ( | 621 5 | + | 59 | ) | − | 43 50 | x | = | 109 2 |
| 方程左边 = | 621 5 | + | 59 | − | 43 50 | x |
| = | 916 5 | − | 43 50 | x |
916 5 | − | 43 50 | x | = | 109 2 |
| - | 43 50 | x | = | 109 2 | − | 916 5 |
| - | 43 50 | x | = | - | 1287 10 |
1287 10 | = | 43 50 | x |
43 50 | x | = | 1287 10 |
| x | = | 1287 10 | ÷ | 43 50 |
| = | 1287 10 | × | 50 43 |
| = | 1287 | × | 5 43 |
| x | = | 6435 43 |
| x | = | 149.651163 |