| 2 | ( | 3 | ( | - | 4 | ( | 3 | x | + | 10 | ) | + | 1 | ) | − | 1 | ) | + | 12 | = | 7 | x | − | 66 |
| 方程左边 = | 2 | × | 3 | ( | - | 4 | ( | 3 | x | + | 10 | ) | + | 1 | ) | − | 2 | × | 1 | + | 12 |
| = | 6 | ( | - | 4 | ( | 3 | x | + | 10 | ) | + | 1 | ) | − | 2 | + | 12 |
| = | 6 | ( | - | 4 | ( | 3 | x | + | 10 | ) | + | 1 | ) | + | 10 |
| = | - | 6 | × | 4 | ( | 3 | x | + | 10 | ) | + | 6 | × | 1 | + | 10 |
| = | - | 24 | ( | 3 | x | + | 10 | ) | + | 6 | + | 10 |
| = | - | 24 | ( | 3 | x | + | 10 | ) | + | 16 |
| = | - | 24 | × | 3 | x | − | 24 | × | 10 | + | 16 |
| = | - | 72 | x | − | 240 | + | 16 |
| = | - | 72 | x | − | 224 |
| - | 72 | x | − | 224 | = | 7 | x | − | 66 |
| - | 72 | x | − | 7 | x | = | - | 66 | + | 224 |
| - | 79 | x | = | - | 66 | + | 224 |
| - | 79 | x | = | 158 |
| - | 158 | = | 79 | x |
| 79 | x | = | - | 158 |
| x | = | - | 158 | ÷ | 79 |
| = | - | 158 | × | 1 79 |
| = | - | 2 | × | 1 |
| x | = | - | 2 |