| 4 | x | ÷ | 5 | + | 5 | ( | 88 | − | x | ) | ÷ | 4 | + | x | = | 88 |
| 方程左边 = | 4 5 | x | + | 5 4 | ( | 88 | − | x | ) | + | x |
| = | 9 5 | x | + | 5 4 | ( | 88 | − | x | ) |
9 5 | x | + | 5 4 | ( | 88 | − | x | ) | = | 88 |
| 方程左边 = | 9 5 | x | + | 5 4 | × | 88 | − | 5 4 | x |
| = | 9 5 | x | + | 110 | − | 5 4 | x |
| = | 11 20 | x | + | 110 |
11 20 | x | + | 110 | = | 88 |
11 20 | x | = | 88 | − | 110 |
11 20 | x | = | - | 22 |
| x | = | - | 22 | ÷ | 11 20 |
| = | - | 22 | × | 20 11 |
| = | - | 2 | × | 20 |
| x | = | - | 40 |