| 10 | − | 4 | ( | x | − | 3 | ) | = | 3 | ( | x | − | 2 | ) |
| 方程左边 = | 10 | − | 4 | x | + | 4 | × | 3 |
| = | 10 | − | 4 | x | + | 12 |
| = | 22 | − | 4 | x |
| 22 | − | 4 | x | = | 3 | ( | x | − | 2 | ) |
| 方程右边 = | 3 | x | − | 3 | × | 2 |
| = | 3 | x | − | 6 |
| 22 | − | 4 | x | = | 3 | x | − | 6 |
| - | 4 | x | − | 3 | x | = | - | 6 | − | 22 |
| - | 7 | x | = | - | 6 | − | 22 |
| - | 7 | x | = | - | 28 |
| 28 | = | 7 | x |
| 7 | x | = | 28 |
| x | = | 28 | ÷ | 7 |
| = | 28 | × | 1 7 |
| = | 4 | × | 1 |
| x | = | 4 |
| ( | 1 | − | x | ) | ÷ | 3 | = | ( | 1 | − | 2 | x | ) | ÷ | 7 |
| 方程左边 = | 1 | × | 1 3 | − | x | × | 1 3 |
| = | 1 3 | − | x | × | 1 3 |
1 3 | − | 1 3 | x | = | ( | 1 | − | 2 | x | ) | ÷ | 7 |
| 方程右边 = | 1 | × | 1 7 | − | 2 | x | × | 1 7 |
| = | 1 7 | − | 2 7 | x |
1 3 | − | 1 3 | x | = | 1 7 | − | 2 7 | x |
| - | 1 3 | x | + | 2 7 | x | = | 1 7 | − | 1 3 |
| - | 1 21 | x | = | 1 7 | − | 1 3 |
| - | 1 21 | x | = | - | 4 21 |
4 21 | = | 1 21 | x |
1 21 | x | = | 4 21 |
| x | = | 4 21 | ÷ | 1 21 |
| = | 4 21 | × | 21 |
| = | 4 | × | 1 |
| x | = | 4 |