| 14 | + | 12 5 | ( | x | − | 3 | ) | − | 89 5 | = | ( | 5 2 | + | 2 5 | ) | x |
| 方程左边 = | - | 19 5 | + | 12 5 | ( | x | − | 3 | ) |
| - | 19 5 | + | 12 5 | ( | x | − | 3 | ) | = | ( | 5 2 | + | 2 5 | ) | x |
| 方程左边 = | - | 19 5 | + | 12 5 | x | − | 12 5 | × | 3 |
| = | - | 19 5 | + | 12 5 | x | − | 36 5 |
| = | - | 11 | + | 12 5 | x |
| - | 11 | + | 12 5 | x | = | ( | 5 2 | + | 2 5 | ) | x |
| 方程右边 = | 5 2 | x | + | 2 5 | x |
| = | 29 10 | x |
| - | 11 | + | 12 5 | x | = | 29 10 | x |
12 5 | x | − | 29 10 | x | = | 11 |
| - | 1 2 | x | = | 11 |
| - | 11 | = | 1 2 | x |
1 2 | x | = | - | 11 |
| x | = | - | 11 | ÷ | 1 2 |
| = | - | 11 | × | 2 |
| x | = | - | 22 |