| 500 | ( | 1 | + | x | ) | ( | 27 25 | + | x | ) | = | 112 |
| 方程左边 = | 500 | × | 1 | ( | 27 25 | + | x | ) | + | 500 | x | ( | 27 25 | + | x | ) |
| = | 500 | ( | 27 25 | + | x | ) | + | 500 | x | ( | 27 25 | + | x | ) |
| = | 500 | × | 27 25 | + | 500 | x | + | 500 | x | ( | 27 25 | + | x | ) |
| = | 540 | + | 500 | x | + | 500 | x | ( | 27 25 | + | x | ) |
| = | 540 | + | 500 | x | + | 500 | x | × | 27 25 | + | 500 | x | x |
| = | 540 | + | 500 | x | + | 540 | x | + | 500 | x | x |
| = | 540 | + | 1040 | x | + | 500 | x | x |
| 540 | + | 1040 | x | + | 500 | x | x | = | 112 |