1 2 | = | 1 5 | ÷ | ( | ( | x | − | 20 | ) | ÷ | 10 | ) |
| 方程两边同时乘以: | ( | ( | x | − | 20 | ) | ÷ | 10 | ) |
1 2 | ( | ( | x | − | 20 | ) | ÷ | 10 | ) | = | 1 5 |
1 2 | ( | x | − | 20 | ) | ÷ | 10 | = | 1 5 |
1 20 | ( | x | − | 20 | ) | = | 1 5 |
1 20 | x | − | 1 20 | × | 20 | = | 1 5 |
1 20 | x | − | 1 | = | 1 5 |
1 20 | x | = | 1 5 | + | 1 |
1 20 | x | = | 6 5 |
| x | = | 6 5 | ÷ | 1 20 |
| = | 6 5 | × | 20 |
| = | 6 | × | 4 |
| x | = | 24 |