| 3 | ( | x | + | 9 10 | ) | = | 5 | ( | x | − | 17 10 | ) |
| 方程左边 = | 3 | x | + | 3 | × | 9 10 |
| = | 3 | x | + | 27 10 |
| 3 | x | + | 27 10 | = | 5 | ( | x | − | 17 10 | ) |
| 方程右边 = | 5 | x | − | 5 | × | 17 10 |
| = | 5 | x | − | 17 2 |
| 3 | x | + | 27 10 | = | 5 | x | − | 17 2 |
| 3 | x | − | 5 | x | = | - | 17 2 | − | 27 10 |
| - | 2 | x | = | - | 17 2 | − | 27 10 |
| - | 2 | x | = | - | 56 5 |
56 5 | = | 2 | x |
| 2 | x | = | 56 5 |
| x | = | 56 5 | ÷ | 2 |
| = | 56 5 | × | 1 2 |
| = | 28 5 | × | 1 |
| x | = | 28 5 |
| x | = | 5.6 |