128 5 | x | + | 21 | ( | 50 | − | x | ) | = | 253 10 | × | 45 |
| 方程左边 = | 128 5 | x | + | 21 | × | 50 | − | 21 | x |
| = | 128 5 | x | + | 1050 | − | 21 | x |
| = | 23 5 | x | + | 1050 |
23 5 | x | + | 1050 | = | 253 10 | × | 45 |
| 方程右边 = | 2277 2 |
23 5 | x | + | 1050 | = | 2277 2 |
23 5 | x | = | 2277 2 | − | 1050 |
23 5 | x | = | 177 2 |
| x | = | 177 2 | ÷ | 23 5 |
| = | 177 2 | × | 5 23 |
| x | = | 885 46 |
| x | = | 19.23913 |