| 2 | ÷ | 13 | × | x | + | 30 | = | ( | x | − | 2 | ÷ | 13 | × | x | − | 30 | ) | × | 5 | ÷ | 8 |
| 方程左边 = | 2 13 | x | + | 30 |
2 13 | x | + | 30 | = | ( | x | − | 2 | ÷ | 13 | × | x | − | 30 | ) | × | 5 | ÷ | 8 |
| 方程右边 = | ( | x | − | 2 | ÷ | 13 | × | x | − | 30 | ) | × | 5 8 |
2 13 | x | + | 30 | = | ( | x | − | 2 | ÷ | 13 | × | x | − | 30 | ) | × | 5 8 |
| 方程右边 = | x | × | 5 8 | − | 2 | ÷ | 13 | × | x | × | 5 8 | − | 30 | × | 5 8 |
| = | x | × | 5 8 | − | 5 52 | x | − | 75 4 |
| = | 55 104 | x | − | 75 4 |
2 13 | x | + | 30 | = | 55 104 | x | − | 75 4 |
2 13 | x | − | 55 104 | x | = | - | 75 4 | − | 30 |
| - | 3 8 | x | = | - | 75 4 | − | 30 |
| - | 3 8 | x | = | - | 195 4 |
195 4 | = | 3 8 | x |
3 8 | x | = | 195 4 |
| x | = | 195 4 | ÷ | 3 8 |
| = | 195 4 | × | 8 3 |
| = | 65 | × | 2 |
| x | = | 130 |