13 5 | + | 2 | x | = | 18 5 |
| 2 | x | = | 18 5 | − | 13 5 |
| 2 | x | = | 1 |
| x | = | 1 | ÷ | 2 |
| = | 1 | × | 1 2 |
| x | = | 1 2 |
| x | = | 0.5 |
| 5 | ( | 2 | x | + | 1 5 | ) | = | 45 |
| 方程左边 = | 5 | × | 2 | x | + | 5 | × | 1 5 |
| = | 10 | x | + | 1 |
| 10 | x | + | 1 | = | 45 |
| 10 | x | = | 45 | − | 1 |
| 10 | x | = | 44 |
| x | = | 44 | ÷ | 10 |
| = | 44 | × | 1 10 |
| = | 22 | × | 1 5 |
| x | = | 22 5 |
| x | = | 4.4 |
6 5 | x | + | 30 | = | 48 5 | x | − | 12 |
6 5 | x | − | 48 5 | x | = | - | 12 | − | 30 |
| - | 42 5 | x | = | - | 12 | − | 30 |
| - | 42 5 | x | = | - | 42 |
| 42 | = | 42 5 | x |
42 5 | x | = | 42 |
| x | = | 42 | ÷ | 42 5 |
| = | 42 | × | 5 42 |
| = | 1 | × | 5 |
| x | = | 5 |
| 9 | x | = | 3 | ( | 6 5 | − | x | ) |
| 方程右边 = | 3 | × | 6 5 | − | 3 | x |
| = | 18 5 | − | 3 | x |
| 9 | x | = | 18 5 | − | 3 | x |
| 9 | x | + | 3 | x | = | 18 5 |
| 12 | x | = | 18 5 |
| x | = | 18 5 | ÷ | 12 |
| = | 18 5 | × | 1 12 |
| = | 3 5 | × | 1 2 |
| x | = | 3 10 |
| x | = | 0.3 |