| ( | x | + | 128 | ) | ÷ | 4 5 | × | 1 2 | − | x | = | 0 |
| 方程左边 = | ( | x | + | 128 | ) | × | 5 8 | − | x |
| ( | x | + | 128 | ) | × | 5 8 | − | x | = | 0 |
| 方程左边 = | x | × | 5 8 | + | 128 | × | 5 8 | − | x |
| = | x | × | 5 8 | + | 80 | − | x |
| = | - | 3 8 | x | + | 80 |
| - | 3 8 | x | + | 80 | = | 0 |
| - | 3 8 | x | = | 0 | − | 80 |
| - | 3 8 | x | = | - | 80 |
| 80 | = | 3 8 | x |
3 8 | x | = | 80 |
| x | = | 80 | ÷ | 3 8 |
| = | 80 | × | 8 3 |
| x | = | 640 3 |
| x | = | 213.333333 |