| 120000 | + | 210 | x | + | 10000 | + | 2000 | x | + | 2000 | x | = | 6000 | x |
| 方程左边 = | 130000 | + | 4210 | x |
| 130000 | + | 4210 | x | = | 6000 | x |
| 4210 | x | − | 6000 | x | = | - | 130000 |
| - | 1790 | x | = | - | 130000 |
| 130000 | = | 1790 | x |
| 1790 | x | = | 130000 |
| x | = | 130000 | ÷ | 1790 |
| = | 130000 | × | 1 1790 |
| = | 13000 | × | 1 179 |
| x | = | 13000 179 |
| x | = | 72.625698 |