2 | x | − | 3 | = | 2 | ( | 2 | ( | 2 | x | − | 3 | ) | − | 3 | ) | − | 3 |
方程右边 = | 2 | × | 2 | ( | 2 | x | − | 3 | ) | − | 2 | × | 3 | − | 3 |
= | 4 | ( | 2 | x | − | 3 | ) | − | 6 | − | 3 |
= | 4 | ( | 2 | x | − | 3 | ) | − | 9 |
= | 4 | × | 2 | x | − | 4 | × | 3 | − | 9 |
= | 8 | x | − | 12 | − | 9 |
= | 8 | x | − | 21 |
2 | x | − | 3 | = | 8 | x | − | 21 |
2 | x | − | 8 | x | = | - | 21 | + | 3 |
- | 6 | x | = | - | 21 | + | 3 |
- | 6 | x | = | - | 18 |
18 | = | 6 | x |
6 | x | = | 18 |
x | = | 18 | ÷ | 6 |
= | 18 | × | 1 6 |
= | 3 | × | 1 |
x | = | 3 |