20 | − | 5 2 | ( | x | − | 2 | ) | − | 12 5 | ( | 3 | − | 1 2 | x | ) | = | 47 10 | − | ( | 3 | − | x | ) |
方程左边 = | 20 | − | 5 2 | x | + | 5 2 | × | 2 | − | 12 5 | ( | 3 | − | 1 2 | x | ) |
= | 20 | − | 5 2 | x | + | 5 | − | 12 5 | ( | 3 | − | 1 2 | x | ) |
= | 25 | − | 5 2 | x | − | 12 5 | ( | 3 | − | 1 2 | x | ) |
= | 25 | − | 5 2 | x | − | 12 5 | × | 3 | + | 12 5 | × | 1 2 | x |
= | 25 | − | 5 2 | x | − | 36 5 | + | 6 5 | x |
= | 89 5 | − | 13 10 | x |
89 5 | − | 13 10 | x | = | 47 10 | − | ( | 3 | − | x | ) |
方程右边 = | 47 10 | − | 3 | + | x |
= | 17 10 | + | x |
89 5 | − | 13 10 | x | = | 17 10 | + | x |
- | 13 10 | x | − | x | = | 17 10 | − | 89 5 |
- | 23 10 | x | = | 17 10 | − | 89 5 |
- | 23 10 | x | = | - | 161 10 |
161 10 | = | 23 10 | x |
23 10 | x | = | 161 10 |
x | = | 161 10 | ÷ | 23 10 |
= | 161 10 | × | 10 23 |
= | 7 | × | 1 |
x | = | 7 |