| ( | 25697 1000 | + | x | ) | × | 51 20 | = | 51393 1000 | + | 6989 100 | − | x |
| 方程左边 = | 25697 1000 | × | 51 20 | + | x | × | 51 20 |
| = | 1310547 20000 | + | x | × | 51 20 |
1310547 20000 | + | 51 20 | x | = | 51393 1000 | + | 6989 100 | − | x |
| 方程右边 = | 121283 1000 | − | x |
1310547 20000 | + | 51 20 | x | = | 121283 1000 | − | x |
51 20 | x | + | x | = | 121283 1000 | − | 1310547 20000 |
71 20 | x | = | 121283 1000 | − | 1310547 20000 |
71 20 | x | = | 1115113 20000 |
| x | = | 1115113 20000 | ÷ | 71 20 |
| = | 1115113 20000 | × | 20 71 |
| = | 1115113 1000 | × | 1 71 |
| x | = | 1115113 71000 |
| x | = | 15.705817 |