| 1 | ÷ | 6 | + | 1 | ÷ | 8 | × | ( | 72 | − | x | ) | = | 72 |
| 方程左边 = | 1 6 | + | 1 8 | ( | 72 | − | x | ) |
1 6 | + | 1 8 | ( | 72 | − | x | ) | = | 72 |
| 方程左边 = | 1 6 | + | 1 8 | × | 72 | − | 1 8 | x |
| = | 1 6 | + | 9 | − | 1 8 | x |
| = | 55 6 | − | 1 8 | x |
55 6 | − | 1 8 | x | = | 72 |
| - | 1 8 | x | = | 72 | − | 55 6 |
| - | 1 8 | x | = | 377 6 |
| - | 377 6 | = | 1 8 | x |
1 8 | x | = | - | 377 6 |
| x | = | - | 377 6 | ÷ | 1 8 |
| = | - | 377 6 | × | 8 |
| = | - | 377 3 | × | 4 |
| x | = | - | 1508 3 |
| x | = | - 502.666667 |