| 25 | ( | 717 500 | + | X | ) | ( | 717 500 | + | X | ) | = | 1 10 | ( | 81 5 | X | + | 639 50 | ) |
| 方程左边 = | 25 | × | 717 500 | ( | 717 500 | + | X | ) | + | 25 | X | ( | 717 500 | + | X | ) |
| = | 717 20 | ( | 717 500 | + | X | ) | + | 25 | X | ( | 717 500 | + | X | ) |
| = | 717 20 | × | 717 500 | + | 717 20 | X | + | 25 | X | ( | 717 500 | + | X | ) |
| = | 514089 10000 | + | 717 20 | X | + | 25 | X | ( | 717 500 | + | X | ) |
| = | 514089 10000 | + | 717 20 | X | + | 25 | X | × | 717 500 | + | 25 | X | X |
| = | 514089 10000 | + | 717 20 | X | + | 717 20 | X | + | 25 | X | X |
| = | 514089 10000 | + | 717 10 | X | + | 25 | X | X |
514089 10000 | + | 717 10 | X | + | 25 | X | X | = | 1 10 | ( | 81 5 | X | + | 639 50 | ) |
| 方程右边 = | 1 10 | × | 81 5 | X | + | 1 10 | × | 639 50 |
| = | 81 50 | X | + | 639 500 |
514089 10000 | + | 717 10 | X | + | 25 | X | X | = | 81 50 | X | + | 639 500 |