| 6500 | ( | 1 | + | x | ) | ( | 1 | + | x | ) | = | 5260 |
| 方程左边 = | 6500 | × | 1 | ( | 1 | + | x | ) | + | 6500 | x | ( | 1 | + | x | ) |
| = | 6500 | ( | 1 | + | x | ) | + | 6500 | x | ( | 1 | + | x | ) |
| = | 6500 | × | 1 | + | 6500 | x | + | 6500 | x | ( | 1 | + | x | ) |
| = | 6500 | + | 6500 | x | + | 6500 | x | ( | 1 | + | x | ) |
| = | 6500 | + | 6500 | x | + | 6500 | x | × | 1 | + | 6500 | x | x |
| = | 6500 | + | 6500 | x | + | 6500 | x | + | 6500 | x | x |
| = | 6500 | + | 13000 | x | + | 6500 | x | x |
| 6500 | + | 13000 | x | + | 6500 | x | x | = | 5260 |