9 10 | × | 657 25 | × | 270 | × | 84 | + | 391 20 | × | 270 | ( | x | − | 84 | ) | = | 462 | × | 443 | + | 9 10 | × | 509 | × | 459 | − | 9 10 | × | 402 | × | 440 | − | 308 | × | 660 | ( | 5 4 | x | − | 84 | − | 25 | ) | ÷ | 5 4 |
| 方程左边 = | 13410684 25 | + | 10557 2 | ( | x | − | 84 | ) |
13410684 25 | + | 10557 2 | ( | x | − | 84 | ) | = | 462 | × | 443 | + | 9 10 | × | 509 | × | 459 | − | 9 10 | × | 402 | × | 440 | − | 308 | × | 660 | ( | 5 4 | x | − | 84 | − | 25 | ) | ÷ | 5 4 |
| 方程左边 = | 13410684 25 | + | 10557 2 | x | − | 10557 2 | × | 84 |
| = | 13410684 25 | + | 10557 2 | x | − | 443394 |
| = | 2325834 25 | + | 10557 2 | x |
2325834 25 | + | 10557 2 | x | = | 462 | × | 443 | + | 9 10 | × | 509 | × | 459 | − | 9 10 | × | 402 | × | 440 | − | 308 | × | 660 | ( | 5 4 | x | − | 84 | − | 25 | ) | ÷ | 5 4 |
| 方程右边 = | 204666 | + | 2102679 10 | − | 159192 | − | 162624 | ( | 5 4 | x | − | 84 | − | 25 | ) | x |
| = | 2557419 10 | − | 162624 | ( | 5 4 | x | − | 84 | − | 25 | ) | x |
2325834 25 | + | 10557 2 | x | = | 2557419 10 | − | 162624 | ( | 5 4 | x | − | 84 | − | 25 | ) | x |
| 方程右边 = | 2557419 10 | − | 162624 | × | 5 4 | x | x | + | 162624 | × | 84 | x | + | 162624 | × | 25 | x |
| = | 2557419 10 | − | 203280 | x | x | + | 13660416 | x | + | 4065600 | x |
| = | 2557419 10 | − | 203280 | x | x | + | 17726016 | x |
2325834 25 | + | 10557 2 | x | = | 2557419 10 | − | 203280 | x | x | + | 17726016 | x |