| ( | 3 | x | − | 3 | ) | ÷ | 2 | = | ( | 2 | x | + | 13 | ) | ÷ | 3 |
| 方程左边 = | 3 | x | × | 1 2 | − | 3 | × | 1 2 |
| = | 3 2 | x | − | 3 2 |
3 2 | x | − | 3 2 | = | ( | 2 | x | + | 13 | ) | ÷ | 3 |
| 方程右边 = | 2 | x | × | 1 3 | + | 13 | × | 1 3 |
| = | 2 3 | x | + | 13 3 |
3 2 | x | − | 3 2 | = | 2 3 | x | + | 13 3 |
3 2 | x | − | 2 3 | x | = | 13 3 | + | 3 2 |
5 6 | x | = | 13 3 | + | 3 2 |
5 6 | x | = | 35 6 |
| x | = | 35 6 | ÷ | 5 6 |
| = | 35 6 | × | 6 5 |
| = | 7 | × | 1 |
| x | = | 7 |