| ( | 25851 1000 | + | x | ) | × | 51 20 | = | 25851 500 | + | 70353 1000 | − | x |
| 方程左边 = | 25851 1000 | × | 51 20 | + | x | × | 51 20 |
| = | 1318401 20000 | + | x | × | 51 20 |
1318401 20000 | + | 51 20 | x | = | 25851 500 | + | 70353 1000 | − | x |
| 方程右边 = | 24411 200 | − | x |
1318401 20000 | + | 51 20 | x | = | 24411 200 | − | x |
51 20 | x | + | x | = | 24411 200 | − | 1318401 20000 |
71 20 | x | = | 24411 200 | − | 1318401 20000 |
71 20 | x | = | 1122699 20000 |
| x | = | 1122699 20000 | ÷ | 71 20 |
| = | 1122699 20000 | × | 20 71 |
| = | 1122699 1000 | × | 1 71 |
| x | = | 1122699 71000 |
| x | = | 15.812662 |