| 25 | ÷ | ( | 1 | − | 1 | ÷ | ( | 3 5 | + | 3 5 | ) | ) | = | x |
| 方程两边同时乘以: | ( | 1 | − | 1 | ÷ | ( | 3 5 | + | 3 5 | ) | ) |
| 25 | = | x | ( | 1 | − | 1 | ÷ | ( | 3 5 | + | 3 5 | ) | ) |
| 25 | = | x | × | 1 | − | x | × | 1 | ÷ | ( | 3 5 | + | 3 5 | ) |
| 方程两边同时乘以: | ( | 3 5 | + | 3 5 | ) |
| 25 | ( | 3 5 | + | 3 5 | ) | = | 1 | x | ( | 3 5 | + | 3 5 | ) | − | x | × | 1 |
| 25 | × | 3 5 | + | 25 | × | 3 5 | = | 1 | x | ( | 3 5 | + | 3 5 | ) | − | x | × | 1 |
| 25 | × | 3 5 | + | 25 | × | 3 5 | = | 1 | x | × | 3 5 | + | 1 | x | × | 3 5 | − | x | × | 1 |
| 15 | + | 15 | = | 3 5 | x | + | 3 5 | x | − | x | × | 1 |
| 30 | = | 1 5 | x |
| - | 1 5 | x | = | - | 30 |
| 30 | = | 1 5 | x |
1 5 | x | = | 30 |
| x | = | 30 | ÷ | 1 5 |
| = | 30 | × | 5 |
| x | = | 150 |