9 10 | ( | 2 | x | − | 5 | ) | ÷ | 6 | = | 27 5 |
| 方程左边 = | 3 20 | ( | 2 | x | − | 5 | ) |
3 20 | ( | 2 | x | − | 5 | ) | = | 27 5 |
| 方程左边 = | 3 20 | × | 2 | x | − | 3 20 | × | 5 |
| = | 3 10 | x | − | 3 4 |
3 10 | x | − | 3 4 | = | 27 5 |
3 10 | x | = | 27 5 | + | 3 4 |
3 10 | x | = | 123 20 |
| x | = | 123 20 | ÷ | 3 10 |
| = | 123 20 | × | 10 3 |
| = | 41 2 | × | 1 |
| x | = | 41 2 |
| x | = | 20.5 |
21 10 | ÷ | ( | x | − | 3 5 | ) | = | 7 5 |
| 方程两边同时乘以: | ( | x | − | 3 5 | ) |
21 10 | = | 7 5 | ( | x | − | 3 5 | ) |
21 10 | = | 7 5 | x | − | 7 5 | × | 3 5 |
21 10 | = | 7 5 | x | − | 21 25 |
| - | 7 5 | x | = | - | 21 25 | − | 21 10 |
| - | 7 5 | x | = | - | 147 50 |
147 50 | = | 7 5 | x |
7 5 | x | = | 147 50 |
| x | = | 147 50 | ÷ | 7 5 |
| = | 147 50 | × | 5 7 |
| = | 21 10 | × | 1 |
| x | = | 21 10 |
| x | = | 2.1 |
13 5 | x | − | x | − | 1 10 | x | = | 3 4 |
| 方程左边 = | 3 2 | x |
3 2 | x | = | 3 4 |
| x | = | 3 4 | ÷ | 3 2 |
| = | 3 4 | × | 2 3 |
| = | 1 2 | × | 1 |
| x | = | 1 2 |
| x | = | 0.5 |