| 56 | ÷ | 2 | + | ( | ( | 49 | + | 38 | + | x | ) | ÷ | 3 | ) | ÷ | 2 | = | 50 |
| 方程左边 = | 28 | + | ( | ( | 49 | + | 38 | + | x | ) | ÷ | 3 | ) | × | 1 2 |
| 28 | + | ( | ( | 49 | + | 38 | + | x | ) | ÷ | 3 | ) | × | 1 2 | = | 50 |
| 方程左边 = | 28 | + | ( | 49 | + | 38 | + | x | ) | ÷ | 3 | × | 1 2 |
| = | 28 | + | ( | 49 | + | 38 | + | x | ) | × | 1 6 |
| = | 28 | + | 49 | × | 1 6 | + | 38 | × | 1 6 | + | x | × | 1 6 |
| = | 28 | + | 49 6 | + | 19 3 | + | x | × | 1 6 |
| = | 85 2 | + | 1 6 | x |
85 2 | + | 1 6 | x | = | 50 |
1 6 | x | = | 50 | − | 85 2 |
1 6 | x | = | 15 2 |
| x | = | 15 2 | ÷ | 1 6 |
| = | 15 2 | × | 6 |
| = | 15 | × | 3 |
| x | = | 45 |