| 75 | ÷ | 6 5 | + | 60 | ÷ | 6 5 | × | ( | 1 | + | x% | ) | = | 100 |
| 方程左边 = | 125 2 | + | 50 | ( | 1 | + | x% | ) |
125 2 | + | 50 | ( | 1 | + | x% | ) | = | 100 |
| 方程左边 = | 125 2 | + | 50 | × | 1 | + | 50 | × | x% |
| = | 125 2 | + | 50 | + | 1 2 | x |
| = | 225 2 | + | 1 2 | x |
225 2 | + | 1 2 | x | = | 100 |
1 2 | x | = | 100 | − | 225 2 |
1 2 | x | = | - | 25 2 |
| x | = | - | 25 2 | ÷ | 1 2 |
| = | - | 25 2 | × | 2 |
| = | - | 25 | × | 1 |
| x | = | - | 25 |