| 2 | ( | 3 10 | x | + | 4 | ) | = | 5 | + | 5 | ( | 1 5 | x | − | 1 | ) |
| 方程左边 = | 2 | × | 3 10 | x | + | 2 | × | 4 |
| = | 3 5 | x | + | 8 |
3 5 | x | + | 8 | = | 5 | + | 5 | ( | 1 5 | x | − | 1 | ) |
| 方程右边 = | 5 | + | 5 | × | 1 5 | x | − | 5 | × | 1 |
| = | 5 | + | 1 | x | − | 5 |
| = | 0 | + | 1 | x |
3 5 | x | + | 8 | = | 0 | + | 1 | x |
3 5 | x | − | 1 | x | = | - | 8 |
| - | 2 5 | x | = | - | 8 |
| 8 | = | 2 5 | x |
2 5 | x | = | 8 |
| x | = | 8 | ÷ | 2 5 |
| = | 8 | × | 5 2 |
| = | 4 | × | 5 |
| x | = | 20 |