| 1800 | x | ÷ | 7 10 | + | 130000 | = | 3600 | x | ÷ | 7 10 |
| 方程左边 = | 18000 7 | x | + | 130000 |
18000 7 | x | + | 130000 | = | 3600 | x | ÷ | 7 10 |
| 方程右边 = | 36000 7 | x |
18000 7 | x | + | 130000 | = | 36000 7 | x |
18000 7 | x | − | 36000 7 | x | = | - | 130000 |
| - | 18000 7 | x | = | - | 130000 |
| 130000 | = | 18000 7 | x |
18000 7 | x | = | 130000 |
| x | = | 130000 | ÷ | 18000 7 |
| = | 130000 | × | 7 18000 |
| = | 65 | × | 7 9 |
| x | = | 455 9 |
| x | = | 50.555556 |