| 1247000 | x | + | ( | 200 | − | x | ) | × | 1238000 | = | 42587200 |
| 方程左边 = | 1247000 | x | + | 200 | × | 1238000 | − | x | × | 1238000 |
| = | 1247000 | x | + | 247600000 | − | x | × | 1238000 |
| = | 9000 | x | + | 247600000 |
| 9000 | x | + | 247600000 | = | 42587200 |
| 9000 | x | = | 42587200 | − | 247600000 |
| 9000 | x | = | - | 205012800 |
| x | = | - | 205012800 | ÷ | 9000 |
| = | - | 205012800 | × | 1 9000 |
| = | - | 113896 | × | 1 5 |
| x | = | - | 113896 5 |
| x | = | - 22779.2 |