| ( | 1 | + | x | ) | × | 20 | = | ( | 2 | + | x | ) | × | 32 |
| 方程左边 = | 1 | × | 20 | + | x | × | 20 |
| = | 20 | + | x | × | 20 |
| 20 | + | 20 | x | = | ( | 2 | + | x | ) | × | 32 |
| 方程右边 = | 2 | × | 32 | + | x | × | 32 |
| = | 64 | + | x | × | 32 |
| 20 | + | 20 | x | = | 64 | + | 32 | x |
| 20 | x | − | 32 | x | = | 64 | − | 20 |
| - | 12 | x | = | 64 | − | 20 |
| - | 12 | x | = | 44 |
| - | 44 | = | 12 | x |
| 12 | x | = | - | 44 |
| x | = | - | 44 | ÷ | 12 |
| = | - | 44 | × | 1 12 |
| = | - | 11 | × | 1 3 |
| x | = | - | 11 3 |
| x | = | - 3.666667 |