| ( | 3 | x | − | 2 | ) | ÷ | 20 | = | ( | 2 | ( | x | + | 4 | ) | − | 1 | ) | ÷ | 15 |
| 方程左边 = | 3 | x | × | 1 20 | − | 2 | × | 1 20 |
| = | 3 20 | x | − | 1 10 |
3 20 | x | − | 1 10 | = | ( | 2 | ( | x | + | 4 | ) | − | 1 | ) | ÷ | 15 |
| 方程右边 = | 2 | ( | x | + | 4 | ) | × | 1 15 | − | 1 | × | 1 15 |
| = | 2 15 | ( | x | + | 4 | ) | − | 1 15 |
| = | 2 15 | x | + | 2 15 | × | 4 | − | 1 15 |
| = | 2 15 | x | + | 8 15 | − | 1 15 |
| = | 2 15 | x | + | 7 15 |
3 20 | x | − | 1 10 | = | 2 15 | x | + | 7 15 |
3 20 | x | − | 2 15 | x | = | 7 15 | + | 1 10 |
1 60 | x | = | 7 15 | + | 1 10 |
1 60 | x | = | 17 30 |
| x | = | 17 30 | ÷ | 1 60 |
| = | 17 30 | × | 60 |
| = | 17 | × | 2 |
| x | = | 34 |