| 2 | ( | 3 10 | x | − | 4 | ) | − | 5 | ( | 1 5 | x | × | 3 | ) | = | 9 |
| 方程左边 = | 2 | × | 3 10 | x | − | 2 | × | 4 | − | 5 | ( | 1 5 | x | × | 3 | ) |
| = | 3 5 | x | − | 8 | − | 5 | ( | 1 5 | x | × | 3 | ) |
| = | 3 5 | x | − | 8 | − | 5 | × | 1 5 | x | × | 3 |
| = | 3 5 | x | − | 8 | − | 3 | x |
| = | - | 12 5 | x | − | 8 |
| - | 12 5 | x | − | 8 | = | 9 |
| - | 12 5 | x | = | 9 | + | 8 |
| - | 12 5 | x | = | 17 |
| - | 17 | = | 12 5 | x |
12 5 | x | = | - | 17 |
| x | = | - | 17 | ÷ | 12 5 |
| = | - | 17 | × | 5 12 |
| x | = | - | 85 12 |
| x | = | - 7.083333 |