| ( | 58 | − | 571 10 | ) | ( | x | − | 823 1000 | ) | = | ( | 571 10 | − | 57 | ) | ( | 409 500 | − | x | ) |
| 方程左边 = | 58 | ( | x | − | 823 1000 | ) | − | 571 10 | ( | x | − | 823 1000 | ) |
| = | 58 | x | − | 58 | × | 823 1000 | − | 571 10 | ( | x | − | 823 1000 | ) |
| = | 58 | x | − | 23867 500 | − | 571 10 | ( | x | − | 823 1000 | ) |
| = | 58 | x | − | 23867 500 | − | 571 10 | x | + | 571 10 | × | 823 1000 |
| = | 58 | x | − | 23867 500 | − | 571 10 | x | + | 469933 10000 |
| = | 9 10 | x | − | 7407 10000 |
9 10 | x | − | 7407 10000 | = | ( | 571 10 | − | 57 | ) | ( | 409 500 | − | x | ) |
| 方程右边 = | 571 10 | ( | 409 500 | − | x | ) | − | 57 | ( | 409 500 | − | x | ) |
| = | 571 10 | × | 409 500 | − | 571 10 | x | − | 57 | ( | 409 500 | − | x | ) |
| = | 233539 5000 | − | 571 10 | x | − | 57 | ( | 409 500 | − | x | ) |
| = | 233539 5000 | − | 571 10 | x | − | 57 | × | 409 500 | + | 57 | x |
| = | 233539 5000 | − | 571 10 | x | − | 23313 500 | + | 57 | x |
| = | 409 5000 | − | 1 10 | x |
9 10 | x | − | 7407 10000 | = | 409 5000 | − | 1 10 | x |
9 10 | x | + | 1 10 | x | = | 409 5000 | + | 7407 10000 |
| x | = | 409 5000 | + | 7407 10000 |
| x | = | 409 5000 | + | 7407 10000 |
| x | = | 329 400 |