51 20 | = | 181 100 | x | × | 43 25 | × | 139 100 |
| 方程右边 = | 1081837 250000 | x |
51 20 | = | 1081837 250000 | x |
| - | 1081837 250000 | x | = | - | 51 20 |
51 20 | = | 1081837 250000 | x |
1081837 250000 | x | = | 51 20 |
| x | = | 51 20 | ÷ | 1081837 250000 |
| = | 51 20 | × | 250000 1081837 |
| = | 51 | × | 12500 1081837 |
| x | = | 637500 1081837 |
| x | = | 0.589275 |