89 10 | x | + | 69 5 | ( | 600 | − | x | ) | = | 74127 10 |
| 方程左边 = | 89 10 | x | + | 69 5 | × | 600 | − | 69 5 | x |
| = | 89 10 | x | + | 8280 | − | 69 5 | x |
| = | - | 49 10 | x | + | 8280 |
| - | 49 10 | x | + | 8280 | = | 74127 10 |
| - | 49 10 | x | = | 74127 10 | − | 8280 |
| - | 49 10 | x | = | - | 8673 10 |
8673 10 | = | 49 10 | x |
49 10 | x | = | 8673 10 |
| x | = | 8673 10 | ÷ | 49 10 |
| = | 8673 10 | × | 10 49 |
| = | 177 | × | 1 |
| x | = | 177 |