| X | = | 3 2 | ( | 56 | + | ( | X | + | 56 | ) | ÷ | 5 | ) |
| 方程右边 = | 3 2 | × | 56 | + | 3 2 | ( | X | + | 56 | ) | ÷ | 5 |
| = | 84 | + | 3 10 | ( | X | + | 56 | ) |
| = | 84 | + | 3 10 | X | + | 3 10 | × | 56 |
| = | 84 | + | 3 10 | X | + | 84 5 |
| = | 504 5 | + | 3 10 | X |
| X | = | 504 5 | + | 3 10 | X |
| X | − | 3 10 | X | = | 504 5 |
7 10 | X | = | 504 5 |
| X | = | 504 5 | ÷ | 7 10 |
| = | 504 5 | × | 10 7 |
| = | 72 | × | 2 |
| X | = | 144 |