| ( | 12813 500 | + | x | ) | × | 17 20 | = | 51253 1000 | + | 68679 1000 | − | x |
| 方程左边 = | 12813 500 | × | 17 20 | + | x | × | 17 20 |
| = | 217821 10000 | + | x | × | 17 20 |
217821 10000 | + | 17 20 | x | = | 51253 1000 | + | 68679 1000 | − | x |
| 方程右边 = | 29983 250 | − | x |
217821 10000 | + | 17 20 | x | = | 29983 250 | − | x |
17 20 | x | + | x | = | 29983 250 | − | 217821 10000 |
37 20 | x | = | 29983 250 | − | 217821 10000 |
37 20 | x | = | 981499 10000 |
| x | = | 981499 10000 | ÷ | 37 20 |
| = | 981499 10000 | × | 20 37 |
| = | 26527 500 | × | 1 |
| x | = | 26527 500 |
| x | = | 53.054 |