| ( | 2 | x | ÷ | 3 | ) | − | ( | ( | x | − | 4 | ) | ÷ | 5 | ) | = | 1 |
| 方程左边 = | 2 | x | ÷ | 3 | − | ( | ( | x | − | 4 | ) | ÷ | 5 | ) |
| = | 2 3 | x | − | ( | ( | x | − | 4 | ) | ÷ | 5 | ) |
| = | 2 3 | x | − | ( | x | − | 4 | ) | ÷ | 5 |
| = | 2 3 | x | − | x | × | 1 5 | + | 4 | × | 1 5 |
| = | 2 3 | x | − | x | × | 1 5 | + | 4 5 |
| = | 7 15 | x | + | 4 5 |
7 15 | x | + | 4 5 | = | 1 |
7 15 | x | = | 1 | − | 4 5 |
7 15 | x | = | 1 5 |
| x | = | 1 5 | ÷ | 7 15 |
| = | 1 5 | × | 15 7 |
| = | 1 | × | 3 7 |
| x | = | 3 7 |
| x | = | 0.428571 |