| 12 | x | + | 2 | = | 11 | x | − | 40 |
| 12 | x | − | 11 | x | = | - | 40 | − | 2 |
| x | = | - | 40 | − | 2 |
| x | = | - | 40 | − | 2 |
| x | = | - | 42 |
| 6 | x | − | 6 | = | 4 | x | − | 4 |
| 6 | x | − | 4 | x | = | - | 4 | + | 6 |
| 2 | x | = | - | 4 | + | 6 |
| 2 | x | = | 2 |
| x | = | 2 | ÷ | 2 |
| = | 2 | × | 1 2 |
| = | 1 | × | 1 |
| x | = | 1 |
| 9 | x | + | 18 | = | 3 | x | − | 5 |
| 9 | x | − | 3 | x | = | - | 5 | − | 18 |
| 6 | x | = | - | 5 | − | 18 |
| 6 | x | = | - | 23 |
| x | = | - | 23 | ÷ | 6 |
| = | - | 23 | × | 1 6 |
| x | = | - | 23 6 |
| x | = | - 3.833333 |
| 18 | x | − | 7 | = | 2 | x | − | 3 |
| 18 | x | − | 2 | x | = | - | 3 | + | 7 |
| 16 | x | = | - | 3 | + | 7 |
| 16 | x | = | 4 |
| x | = | 4 | ÷ | 16 |
| = | 4 | × | 1 16 |
| = | 1 | × | 1 4 |
| x | = | 1 4 |
| x | = | 0.25 |
| 7 | x | + | 8 | = | 15 | x |
| 7 | x | − | 15 | x | = | - | 8 |
| - | 8 | x | = | - | 8 |
| 8 | = | 8 | x |
| 8 | x | = | 8 |
| x | = | 8 | ÷ | 8 |
| = | 8 | × | 1 8 |
| = | 1 | × | 1 |
| x | = | 1 |
| 2 | x | + | 3 | x | = | 10 | x | − | 40 |
| 方程左边 = | 5 | x |
| 5 | x | = | 10 | x | − | 40 |
| 5 | x | − | 10 | x | = | - | 40 |
| - | 5 | x | = | - | 40 |
| 40 | = | 5 | x |
| 5 | x | = | 40 |
| x | = | 40 | ÷ | 5 |
| = | 40 | × | 1 5 |
| = | 8 | × | 1 |
| x | = | 8 |
| 50 | − | 4 | x | = | 3 | x | + | 5 |
| - | 4 | x | − | 3 | x | = | 5 | − | 50 |
| - | 7 | x | = | 5 | − | 50 |
| - | 7 | x | = | - | 45 |
| 45 | = | 7 | x |
| 7 | x | = | 45 |
| x | = | 45 | ÷ | 7 |
| = | 45 | × | 1 7 |
| x | = | 45 7 |
| x | = | 6.428571 |