| ( | 39739 1000 | + | x | ) | × | 17 20 | = | 36139 500 | + | 39739 1000 | − | x |
| 方程左边 = | 39739 1000 | × | 17 20 | + | x | × | 17 20 |
| = | 675563 20000 | + | x | × | 17 20 |
675563 20000 | + | 17 20 | x | = | 36139 500 | + | 39739 1000 | − | x |
| 方程右边 = | 112017 1000 | − | x |
675563 20000 | + | 17 20 | x | = | 112017 1000 | − | x |
17 20 | x | + | x | = | 112017 1000 | − | 675563 20000 |
37 20 | x | = | 112017 1000 | − | 675563 20000 |
37 20 | x | = | 1564777 20000 |
| x | = | 1564777 20000 | ÷ | 37 20 |
| = | 1564777 20000 | × | 20 37 |
| = | 1564777 1000 | × | 1 37 |
| x | = | 1564777 37000 |
| x | = | 42.29127 |