| 100 | ÷ | X | + | 10 | = | 150 | ÷ | ( | X | + | 1 2 | ) |
| 方程两边同时乘以: | X | , | ( | X | + | 1 2 | ) |
| 100 | ( | X | + | 1 2 | ) | + | 10 | X | ( | X | + | 1 2 | ) | = | 150 | X |
| 100 | X | + | 100 | × | 1 2 | + | 10 | X | ( | X | + | 1 2 | ) | = | 150 | X |
| 100 | X | + | 50 | + | 10 | X | ( | X | + | 1 2 | ) | = | 150 | X |
| 100 | X | + | 50 | + | 10 | X | X | + | 10 | X | × | 1 2 | = | 150 | X |
| 100 | X | + | 50 | + | 10 | X | X | + | 5 | X | = | 150 | X |
| 105 | X | + | 50 | + | 10 | X | X | = | 150 | X |
| X1=2 |
| X2= | 5 2 |