| 5 | ( | x | − | 30 | ) | = | ( | 130 | − | x | ) | ÷ | 18 25 |
| 方程左边 = | 5 | x | − | 5 | × | 30 |
| = | 5 | x | − | 150 |
| 5 | x | − | 150 | = | ( | 130 | − | x | ) | ÷ | 18 25 |
| 方程右边 = | 130 | × | 25 18 | − | x | × | 25 18 |
| = | 1625 9 | − | x | × | 25 18 |
| 5 | x | − | 150 | = | 1625 9 | − | 25 18 | x |
| 5 | x | + | 25 18 | x | = | 1625 9 | + | 150 |
115 18 | x | = | 1625 9 | + | 150 |
115 18 | x | = | 2975 9 |
| x | = | 2975 9 | ÷ | 115 18 |
| = | 2975 9 | × | 18 115 |
| = | 595 | × | 2 23 |
| x | = | 1190 23 |
| x | = | 51.73913 |