| 25 | − | ( | 6 5 | y | ) | ÷ | y | = | 25 | ÷ | ( | 3 | y | ) |
| 方程两边同时乘以: | y | , | ( | 3 | × | 1 | ) |
| 25 | y | ( | 3 | × | 1 | ) | − | ( | 6 5 | y | ) | ( | 3 | × | 1 | ) | = | 25 | × | 1 |
| 25 | y | × | 3 | × | 1 | − | ( | 6 5 | y | ) | ( | 3 | × | 1 | ) | = | 25 | × | 1 |
| 75 | y | − | ( | 6 5 | y | ) | ( | 3 | × | 1 | ) | = | 25 |
| 75 | y | − | 6 5 | y | ( | 3 | × | 1 | ) | = | 25 |
| 75 | y | − | 6 5 | y | × | 3 | × | 1 | = | 25 |
| 75 | y | − | 18 5 | y | = | 25 |
357 5 | y | = | 25 |
| y | = | 25 | ÷ | 357 5 |
| = | 25 | × | 5 357 |
| y | = | 125 357 |
| y | = | 0.35014 |