2 | ( | 2 | x | − | 1 | ) | − | 4 | ( | 4 | x | − | 1 | ) | − | 5 | ( | 2 | x | + | 1 | ) | − | 19 | = | 0 |
方程左边 = | 2 | × | 2 | x | − | 2 | × | 1 | − | 4 | ( | 4 | x | − | 1 | ) | − | 5 | ( | 2 | x | + | 1 | ) | − | 19 |
= | 4 | x | − | 2 | − | 4 | ( | 4 | x | − | 1 | ) | − | 5 | ( | 2 | x | + | 1 | ) | − | 19 |
= | 4 | x | − | 21 | − | 4 | ( | 4 | x | − | 1 | ) | − | 5 | ( | 2 | x | + | 1 | ) |
= | 4 | x | − | 21 | − | 4 | × | 4 | x | + | 4 | × | 1 | − | 5 | ( | 2 | x | + | 1 | ) |
= | 4 | x | − | 21 | − | 16 | x | + | 4 | − | 5 | ( | 2 | x | + | 1 | ) |
= | - | 12 | x | − | 17 | − | 5 | ( | 2 | x | + | 1 | ) |
= | - | 12 | x | − | 17 | − | 5 | × | 2 | x | − | 5 | × | 1 |
= | - | 12 | x | − | 17 | − | 10 | x | − | 5 |
= | - | 22 | x | − | 22 |
- | 22 | x | − | 22 | = | 0 |
- | 22 | x | = | 0 | + | 22 |
- | 22 | x | = | 22 |
- | 22 | = | 22 | x |
22 | x | = | - | 22 |
x | = | - | 22 | ÷ | 22 |
= | - | 22 | × | 1 22 |
= | - | 1 | × | 1 |
x | = | - | 1 |