( | 6 | X | − | 50 | ) | ÷ | ( | 5 | X | − | 50 | ) | = | 7 | ÷ | 5 |
方程两边同时乘以: | ( | 5 | X | − | 50 | ) |
( | 6 | X | − | 50 | ) | = | 7 | ÷ | 5 | × | ( | 5 | X | − | 50 | ) |
6 | X | − | 50 | = | 7 | ÷ | 5 | × | ( | 5 | X | − | 50 | ) |
6 | X | − | 50 | = | 7 | ÷ | 5 | × | 5 | X | − | 7 | ÷ | 5 | × | 50 |
6 | X | − | 50 | = | 7 | X | − | 70 |
6 | X | − | 7 | X | = | - | 70 | + | 50 |
- | X | = | - | 70 | + | 50 |
- | X | = | - | 70 | + | 50 |
- | X | = | - | 20 |
20 | = | X |
X | = | 20 |