| ( | 5 | x | ( | 10 | + | x | ) | + | 11 | ) | ÷ | ( | 15 | + | x | ) | = | 23 5 |
| 方程两边同时乘以: | ( | 15 | + | x | ) |
| ( | 5 | x | ( | 10 | + | x | ) | + | 11 | ) | = | 23 5 | ( | 15 | + | x | ) |
| 5 | x | ( | 10 | + | x | ) | + | 11 | = | 23 5 | ( | 15 | + | x | ) |
| 5 | x | ( | 10 | + | x | ) | + | 11 | = | 23 5 | × | 15 | + | 23 5 | x |
| 5 | x | ( | 10 | + | x | ) | + | 11 | = | 69 | + | 23 5 | x |
| 5 | x | × | 10 | + | 5 | x | x | + | 11 | = | 69 | + | 23 5 | x |
| 50 | x | + | 5 | x | x | + | 11 | = | 69 | + | 23 5 | x |