57 100 | x | + | 31 50 | ( | x | − | 230 | ) | + | 29 100 | ( | 330 | − | x | ) | = | 1287 10 |
| 方程左边 = | 57 100 | x | + | 31 50 | x | − | 31 50 | × | 230 | + | 29 100 | ( | 330 | − | x | ) |
| = | 57 100 | x | + | 31 50 | x | − | 713 5 | + | 29 100 | ( | 330 | − | x | ) |
| = | 119 100 | x | − | 713 5 | + | 29 100 | ( | 330 | − | x | ) |
| = | 119 100 | x | − | 713 5 | + | 29 100 | × | 330 | − | 29 100 | x |
| = | 119 100 | x | − | 713 5 | + | 957 10 | − | 29 100 | x |
| = | 9 10 | x | − | 469 10 |
9 10 | x | − | 469 10 | = | 1287 10 |
9 10 | x | = | 1287 10 | + | 469 10 |
9 10 | x | = | 878 5 |
| x | = | 878 5 | ÷ | 9 10 |
| = | 878 5 | × | 10 9 |
| = | 878 | × | 2 9 |
| x | = | 1756 9 |
| x | = | 195.111111 |