| ( | 3 | x | − | 7 5 | ) | ÷ | 1 2 | − | ( | 2 | x | − | 19 5 | ) | ÷ | 1 5 | = | ( | 3 2 | − | x | ) | ÷ | 1 10 |
| 方程左边 = | 3 | x | × | 2 | − | 7 5 | × | 2 | − | ( | 2 | x | − | 19 5 | ) | × | 5 |
| = | 6 | x | − | 14 5 | − | ( | 2 | x | − | 19 5 | ) | × | 5 |
| = | 6 | x | − | 14 5 | − | 2 | x | × | 5 | + | 19 5 | × | 5 |
| = | 6 | x | − | 14 5 | − | 10 | x | + | 19 |
| = | - | 4 | x | + | 81 5 |
| - | 4 | x | + | 81 5 | = | ( | 3 2 | − | x | ) | ÷ | 1 10 |
| 方程右边 = | 3 2 | × | 10 | − | x | × | 10 |
| = | 15 | − | x | × | 10 |
| - | 4 | x | + | 81 5 | = | 15 | − | 10 | x |
| - | 4 | x | + | 10 | x | = | 15 | − | 81 5 |
| 6 | x | = | 15 | − | 81 5 |
| 6 | x | = | - | 6 5 |
| x | = | - | 6 5 | ÷ | 6 |
| = | - | 6 5 | × | 1 6 |
| = | - | 1 5 | × | 1 |
| x | = | - | 1 5 |
| x | = | - 0.2 |