| 5 | ÷ | 7 | × | ( | 3 | x | ÷ | 8 | + | 50 | ) | = | 3 | x | ÷ | 8 | + | 50 |
| 方程左边 = | 5 7 | ( | 3 | x | ÷ | 8 | + | 50 | ) |
5 7 | ( | 3 | x | ÷ | 8 | + | 50 | ) | = | 3 | x | ÷ | 8 | + | 50 |
| 方程左边 = | 5 7 | × | 3 | x | ÷ | 8 | + | 5 7 | × | 50 |
| = | 15 56 | x | + | 250 7 |
15 56 | x | + | 250 7 | = | 3 | x | ÷ | 8 | + | 50 |
| 方程右边 = | 3 8 | x | + | 50 |
15 56 | x | + | 250 7 | = | 3 8 | x | + | 50 |
15 56 | x | − | 3 8 | x | = | 50 | − | 250 7 |
| - | 3 28 | x | = | 50 | − | 250 7 |
| - | 3 28 | x | = | 100 7 |
| - | 100 7 | = | 3 28 | x |
3 28 | x | = | - | 100 7 |
| x | = | - | 100 7 | ÷ | 3 28 |
| = | - | 100 7 | × | 28 3 |
| = | - | 100 | × | 4 3 |
| x | = | - | 400 3 |
| x | = | - 133.333333 |