| 80 | − | 2 | x | = | 28 |
| - | 2 | x | = | 28 | − | 80 |
| - | 2 | x | = | - | 52 |
| 52 | = | 2 | x |
| 2 | x | = | 52 |
| x | = | 52 | ÷ | 2 |
| = | 52 | × | 1 2 |
| = | 26 | × | 1 |
| x | = | 26 |
| 2 | x | − | 2 | = | 7 |
| 2 | x | = | 7 | + | 2 |
| 2 | x | = | 9 |
| x | = | 9 | ÷ | 2 |
| = | 9 | × | 1 2 |
| x | = | 9 2 |
| x | = | 4.5 |
| 5 | x | + | 2 | = | 5 |
| 5 | x | = | 5 | − | 2 |
| 5 | x | = | 3 |
| x | = | 3 | ÷ | 5 |
| = | 3 | × | 1 5 |
| x | = | 3 5 |
| x | = | 0.6 |
| 6 | x | + | 4 | x | = | 320 |
| 方程左边 = | 10 | x |
| 10 | x | = | 320 |
| x | = | 320 | ÷ | 10 |
| = | 320 | × | 1 10 |
| = | 32 | × | 1 |
| x | = | 32 |
| 9 | x | ÷ | 3 | = | 6 5 |
| 方程左边 = | 3 | x |
| 3 | x | = | 6 5 |
| x | = | 6 5 | ÷ | 3 |
| = | 6 5 | × | 1 3 |
| = | 2 5 | × | 1 |
| x | = | 2 5 |
| x | = | 0.4 |
| 72 | − | 7 | x | = | 16 |
| - | 7 | x | = | 16 | − | 72 |
| - | 7 | x | = | - | 56 |
| 56 | = | 7 | x |
| 7 | x | = | 56 |
| x | = | 56 | ÷ | 7 |
| = | 56 | × | 1 7 |
| = | 8 | × | 1 |
| x | = | 8 |