| ( | 42309 1000 | + | x | ) | × | 39 20 | = | 37709 500 | − | x | + | 42309 1000 |
| 方程左边 = | 42309 1000 | × | 39 20 | + | x | × | 39 20 |
| = | 1650051 20000 | + | x | × | 39 20 |
1650051 20000 | + | 39 20 | x | = | 37709 500 | − | x | + | 42309 1000 |
| 方程右边 = | 117727 1000 | − | x |
1650051 20000 | + | 39 20 | x | = | 117727 1000 | − | x |
39 20 | x | + | x | = | 117727 1000 | − | 1650051 20000 |
59 20 | x | = | 117727 1000 | − | 1650051 20000 |
59 20 | x | = | 704489 20000 |
| x | = | 704489 20000 | ÷ | 59 20 |
| = | 704489 20000 | × | 20 59 |
| = | 704489 1000 | × | 1 59 |
| x | = | 704489 59000 |
| x | = | 11.940492 |