| ( | 33 10 | − | x | ) | ÷ | 15 | + | ( | 5 | − | x | ) | ÷ | 20 | = | x | ÷ | 15 |
| 方程左边 = | 33 10 | × | 1 15 | − | x | × | 1 15 | + | ( | 5 | − | x | ) | × | 1 20 |
| = | 11 50 | − | x | × | 1 15 | + | ( | 5 | − | x | ) | × | 1 20 |
| = | 11 50 | − | 1 15 | x | + | 5 | × | 1 20 | − | x | × | 1 20 |
| = | 11 50 | − | 1 15 | x | + | 1 4 | − | x | × | 1 20 |
| = | 47 100 | − | 7 60 | x |
47 100 | − | 7 60 | x | = | x | ÷ | 15 |
| - | 7 60 | x | − | 1 15 | x | = | - | 47 100 |
| - | 11 60 | x | = | - | 47 100 |
47 100 | = | 11 60 | x |
11 60 | x | = | 47 100 |
| x | = | 47 100 | ÷ | 11 60 |
| = | 47 100 | × | 60 11 |
| = | 47 5 | × | 3 11 |
| x | = | 141 55 |
| x | = | 2.563636 |