| 1 | ÷ | 3 | × | x | + | 2 | ÷ | 5 | × | ( | 51 | − | x | ) | = | 91 5 |
| 方程左边 = | 1 3 | x | + | 2 5 | ( | 51 | − | x | ) |
1 3 | x | + | 2 5 | ( | 51 | − | x | ) | = | 91 5 |
| 方程左边 = | 1 3 | x | + | 2 5 | × | 51 | − | 2 5 | x |
| = | 1 3 | x | + | 102 5 | − | 2 5 | x |
| = | - | 1 15 | x | + | 102 5 |
| - | 1 15 | x | + | 102 5 | = | 91 5 |
| - | 1 15 | x | = | 91 5 | − | 102 5 |
| - | 1 15 | x | = | - | 11 5 |
11 5 | = | 1 15 | x |
1 15 | x | = | 11 5 |
| x | = | 11 5 | ÷ | 1 15 |
| = | 11 5 | × | 15 |
| = | 11 | × | 3 |
| x | = | 33 |