| - | 8 | + | 4 | ( | - | 1 | − | 7 | + | 2 | ( | 17 | + | x | ) | ) | = | 12 | ( | 3 | x | + | 2 | ) |
| 方程左边 = | - | 8 | − | 4 | × | 1 | − | 4 | × | 7 | + | 4 | × | 2 | ( | 17 | + | x | ) |
| = | - | 8 | − | 4 | − | 28 | + | 8 | ( | 17 | + | x | ) |
| = | - | 40 | + | 8 | ( | 17 | + | x | ) |
| = | - | 40 | + | 8 | × | 17 | + | 8 | x |
| = | - | 40 | + | 136 | + | 8 | x |
| = | 96 | + | 8 | x |
| 96 | + | 8 | x | = | 12 | ( | 3 | x | + | 2 | ) |
| 方程右边 = | 12 | × | 3 | x | + | 12 | × | 2 |
| = | 36 | x | + | 24 |
| 96 | + | 8 | x | = | 36 | x | + | 24 |
| 8 | x | − | 36 | x | = | 24 | − | 96 |
| - | 28 | x | = | 24 | − | 96 |
| - | 28 | x | = | - | 72 |
| 72 | = | 28 | x |
| 28 | x | = | 72 |
| x | = | 72 | ÷ | 28 |
| = | 72 | × | 1 28 |
| = | 18 | × | 1 7 |
| x | = | 18 7 |
| x | = | 2.571429 |