| ( | 36 | + | x | ) | ÷ | ( | 44 | + | x | ) | = | 17 20 |
| 方程两边同时乘以: | ( | 44 | + | x | ) |
| ( | 36 | + | x | ) | = | 17 20 | ( | 44 | + | x | ) |
| 36 | + | x | = | 17 20 | ( | 44 | + | x | ) |
| 36 | + | x | = | 17 20 | × | 44 | + | 17 20 | x |
| 36 | + | x | = | 187 5 | + | 17 20 | x |
| x | − | 17 20 | x | = | 187 5 | − | 36 |
3 20 | x | = | 187 5 | − | 36 |
3 20 | x | = | 7 5 |
| x | = | 7 5 | ÷ | 3 20 |
| = | 7 5 | × | 20 3 |
| = | 7 | × | 4 3 |
| x | = | 28 3 |
| x | = | 9.333333 |