| ( | 1 | − | 60 100 | ) | x | + | 1200 | = | ( | 1 | + | 20 100 | ) | x |
| 方程左边 = | 1 | x | − | 60 100 | x | + | 1200 |
| = | 2 5 | x | + | 1200 |
2 5 | x | + | 1200 | = | ( | 1 | + | 20 100 | ) | x |
| 方程右边 = | 1 | x | + | 20 100 | x |
| = | 6 5 | x |
2 5 | x | + | 1200 | = | 6 5 | x |
2 5 | x | − | 6 5 | x | = | - | 1200 |
| - | 4 5 | x | = | - | 1200 |
| 1200 | = | 4 5 | x |
4 5 | x | = | 1200 |
| x | = | 1200 | ÷ | 4 5 |
| = | 1200 | × | 5 4 |
| = | 300 | × | 5 |
| x | = | 1500 |