| ( | 54 | − | 2 | x | ) | ÷ | 257 200 | + | 40 | = | 50 | + | x |
| 方程左边 = | 54 | × | 200 257 | − | 2 | x | × | 200 257 | + | 40 |
| = | 10800 257 | − | 400 257 | x | + | 40 |
| = | 21080 257 | − | 400 257 | x |
21080 257 | − | 400 257 | x | = | 50 | + | x |
| - | 400 257 | x | − | x | = | 50 | − | 21080 257 |
| - | 657 257 | x | = | 50 | − | 21080 257 |
| - | 657 257 | x | = | - | 8230 257 |
8230 257 | = | 657 257 | x |
657 257 | x | = | 8230 257 |
| x | = | 8230 257 | ÷ | 657 257 |
| = | 8230 257 | × | 257 657 |
| x | = | 2115110 168849 |
| x | = | 8230 657 |
| x | = | 12.526636 |