| ( | ( | 1 | − | 1 2 | x | ) | ÷ | 3 10 | ) | − | ( | ( | 1 5 | x | − | 1 | ) | ÷ | 3 10 | ) | = | 3 10 | x | ÷ | 1 50 |
| 方程左边 = | ( | 1 | − | 1 2 | x | ) | ÷ | 3 10 | − | ( | ( | 1 5 | x | − | 1 | ) | ÷ | 3 10 | ) |
| = | 1 | × | 10 3 | − | 1 2 | x | × | 10 3 | − | ( | ( | 1 5 | x | − | 1 | ) | ÷ | 3 10 | ) |
| = | 10 3 | − | 5 3 | x | − | ( | ( | 1 5 | x | − | 1 | ) | ÷ | 3 10 | ) |
| = | 10 3 | − | 5 3 | x | − | ( | 1 5 | x | − | 1 | ) | ÷ | 3 10 |
| = | 10 3 | − | 5 3 | x | − | 1 5 | x | × | 10 3 | + | 1 | × | 10 3 |
| = | 10 3 | − | 5 3 | x | − | 2 3 | x | + | 10 3 |
| = | 20 3 | − | 7 3 | x |
20 3 | − | 7 3 | x | = | 3 10 | x | ÷ | 1 50 |
| 方程右边 = | 15 | x |
20 3 | − | 7 3 | x | = | 15 | x |
| - | 7 3 | x | − | 15 | x | = | - | 20 3 |
| - | 52 3 | x | = | - | 20 3 |
20 3 | = | 52 3 | x |
52 3 | x | = | 20 3 |
| x | = | 20 3 | ÷ | 52 3 |
| = | 20 3 | × | 3 52 |
| = | 5 | × | 1 13 |
| x | = | 5 13 |
| x | = | 0.384615 |