2 | − | 1 | = | ( | 2 | a | − | 3 | ) | ÷ | ( | a | + | 5 | ) |
方程两边同时乘以: | ( | a | + | 5 | ) |
2 | ( | a | + | 5 | ) | − | 1 | ( | a | + | 5 | ) | = | ( | 2 | a | − | 3 | ) |
2 | a | + | 2 | × | 5 | − | 1 | ( | a | + | 5 | ) | = | ( | 2 | a | − | 3 | ) |
2 | a | + | 2 | × | 5 | − | 1 | ( | a | + | 5 | ) | = | 2 | a | − | 3 |
2 | a | + | 10 | − | 1 | ( | a | + | 5 | ) | = | 2 | a | − | 3 |
2 | a | + | 10 | − | 1 | a | − | 1 | × | 5 | = | 2 | a | − | 3 |
2 | a | + | 10 | − | 1 | a | − | 5 | = | 2 | a | − | 3 |
1 | a | + | 5 | = | 2 | a | − | 3 |
1 | a | − | 2 | a | = | - | 3 | − | 5 |
- | a | = | - | 3 | − | 5 |
- | a | = | - | 3 | − | 5 |
- | a | = | - | 8 |
8 | = | a |
a | = | 8 |