1 25 | ( | 100 | + | x | ) | = | 3 50 | ( | 50 | + | x | ) |
| 方程左边 = | 1 25 | × | 100 | + | 1 25 | x |
| = | 4 | + | 1 25 | x |
| 4 | + | 1 25 | x | = | 3 50 | ( | 50 | + | x | ) |
| 方程右边 = | 3 50 | × | 50 | + | 3 50 | x |
| = | 3 | + | 3 50 | x |
| 4 | + | 1 25 | x | = | 3 | + | 3 50 | x |
1 25 | x | − | 3 50 | x | = | 3 | − | 4 |
| - | 1 50 | x | = | 3 | − | 4 |
| - | 1 50 | x | = | - | 1 |
| 1 | = | 1 50 | x |
1 50 | x | = | 1 |
| x | = | 1 | ÷ | 1 50 |
| = | 1 | × | 50 |
| x | = | 50 |