4 5 | ( | 2 | x | + | 1 2 | ) | − | 12 5 | ( | x | − | 3 | ) | = | 4 5 | x |
| 方程左边 = | 4 5 | × | 2 | x | + | 4 5 | × | 1 2 | − | 12 5 | ( | x | − | 3 | ) |
| = | 8 5 | x | + | 2 5 | − | 12 5 | ( | x | − | 3 | ) |
| = | 8 5 | x | + | 2 5 | − | 12 5 | x | + | 12 5 | × | 3 |
| = | 8 5 | x | + | 2 5 | − | 12 5 | x | + | 36 5 |
| = | - | 4 5 | x | + | 38 5 |
| - | 4 5 | x | + | 38 5 | = | 4 5 | x |
| - | 4 5 | x | − | 4 5 | x | = | - | 38 5 |
| - | 8 5 | x | = | - | 38 5 |
38 5 | = | 8 5 | x |
8 5 | x | = | 38 5 |
| x | = | 38 5 | ÷ | 8 5 |
| = | 38 5 | × | 5 8 |
| = | 19 | × | 1 4 |
| x | = | 19 4 |
| x | = | 4.75 |