| ( | 572 | − | 42 | − | 48 | + | 2 | x | ) | ÷ | 11 | = | 55 |
| 方程左边 = | 572 | × | 1 11 | − | 42 | × | 1 11 | − | 48 | × | 1 11 | + | 2 | x | × | 1 11 |
| = | 52 | − | 42 11 | − | 48 11 | + | 2 11 | x |
| = | 482 11 | + | 2 11 | x |
482 11 | + | 2 11 | x | = | 55 |
2 11 | x | = | 55 | − | 482 11 |
2 11 | x | = | 123 11 |
| x | = | 123 11 | ÷ | 2 11 |
| = | 123 11 | × | 11 2 |
| = | 123 | × | 1 2 |
| x | = | 123 2 |
| x | = | 61.5 |