| 5 | ( | x | − | 30 | ) | = | ( | 130 | − | x | ) | ÷ | 2 5 |
| 方程左边 = | 5 | x | − | 5 | × | 30 |
| = | 5 | x | − | 150 |
| 5 | x | − | 150 | = | ( | 130 | − | x | ) | ÷ | 2 5 |
| 方程右边 = | 130 | × | 5 2 | − | x | × | 5 2 |
| = | 325 | − | x | × | 5 2 |
| 5 | x | − | 150 | = | 325 | − | 5 2 | x |
| 5 | x | + | 5 2 | x | = | 325 | + | 150 |
15 2 | x | = | 325 | + | 150 |
15 2 | x | = | 475 |
| x | = | 475 | ÷ | 15 2 |
| = | 475 | × | 2 15 |
| = | 95 | × | 2 3 |
| x | = | 190 3 |
| x | = | 63.333333 |