| ( | 25697 1000 | + | x | ) | × | 31 20 | = | 51393 1000 | + | 6989 100 | − | x |
| 方程左边 = | 25697 1000 | × | 31 20 | + | x | × | 31 20 |
| = | 796607 20000 | + | x | × | 31 20 |
796607 20000 | + | 31 20 | x | = | 51393 1000 | + | 6989 100 | − | x |
| 方程右边 = | 121283 1000 | − | x |
796607 20000 | + | 31 20 | x | = | 121283 1000 | − | x |
31 20 | x | + | x | = | 121283 1000 | − | 796607 20000 |
51 20 | x | = | 121283 1000 | − | 796607 20000 |
51 20 | x | = | 1629053 20000 |
| x | = | 1629053 20000 | ÷ | 51 20 |
| = | 1629053 20000 | × | 20 51 |
| = | 1629053 1000 | × | 1 51 |
| x | = | 1629053 51000 |
| x | = | 31.942216 |