| ( | 2 | x | − | 1 | ) | ÷ | 5 | − | ( | 2 | x | + | 1 | ) | ÷ | 18 | = | ( | 1 | − | x | ) | ÷ | 6 | − | ( | 1 | − | 6 | x | ) | ÷ | 15 |
| 方程左边 = | 2 | x | × | 1 5 | − | 1 | × | 1 5 | − | ( | 2 | x | + | 1 | ) | × | 1 18 |
| = | 2 5 | x | − | 1 5 | − | ( | 2 | x | + | 1 | ) | × | 1 18 |
| = | 2 5 | x | − | 1 5 | − | 2 | x | × | 1 18 | − | 1 | × | 1 18 |
| = | 2 5 | x | − | 1 5 | − | 1 9 | x | − | 1 18 |
| = | 13 45 | x | − | 23 90 |
13 45 | x | − | 23 90 | = | ( | 1 | − | x | ) | ÷ | 6 | − | ( | 1 | − | 6 | x | ) | ÷ | 15 |
| 方程右边 = | 1 | × | 1 6 | − | x | × | 1 6 | − | ( | 1 | − | 6 | x | ) | × | 1 15 |
| = | 1 6 | − | x | × | 1 6 | − | ( | 1 | − | 6 | x | ) | × | 1 15 |
| = | 1 6 | − | 1 6 | x | − | 1 | × | 1 15 | + | 6 | x | × | 1 15 |
| = | 1 6 | − | 1 6 | x | − | 1 15 | + | 2 5 | x |
| = | 1 10 | + | 7 30 | x |
13 45 | x | − | 23 90 | = | 1 10 | + | 7 30 | x |
13 45 | x | − | 7 30 | x | = | 1 10 | + | 23 90 |
1 18 | x | = | 1 10 | + | 23 90 |
1 18 | x | = | 16 45 |
| x | = | 16 45 | ÷ | 1 18 |
| = | 16 45 | × | 18 |
| = | 16 5 | × | 2 |
| x | = | 32 5 |
| x | = | 6.4 |