13 | − | 2 | ( | 2 | x | − | 3 | ) | = | 5 | − | ( | x | − | 2 | ) |
方程左边 = | 13 | − | 2 | × | 2 | x | + | 2 | × | 3 |
= | 13 | − | 4 | x | + | 6 |
= | 19 | − | 4 | x |
19 | − | 4 | x | = | 5 | − | ( | x | − | 2 | ) |
方程右边 = | 5 | − | x | + | 2 |
= | 7 | − | x |
19 | − | 4 | x | = | 7 | − | x |
- | 4 | x | + | x | = | 7 | − | 19 |
- | 3 | x | = | 7 | − | 19 |
- | 3 | x | = | - | 12 |
12 | = | 3 | x |
3 | x | = | 12 |
x | = | 12 | ÷ | 3 |
= | 12 | × | 1 3 |
= | 4 | × | 1 |
x | = | 4 |