3 4 | = | 1 2 | + | ( | x | − | 50 | ) | × | 1 20 | − | 30 | × | 1 20 |
方程右边 = | 1 2 | + | ( | x | − | 50 | ) | × | 1 20 | − | 3 2 |
= | - | 1 | + | ( | x | − | 50 | ) | × | 1 20 |
3 4 | = | - | 1 | + | ( | x | − | 50 | ) | × | 1 20 |
方程右边 = | - | 1 | + | x | × | 1 20 | − | 50 | × | 1 20 |
= | - | 1 | + | x | × | 1 20 | − | 5 2 |
= | - | 7 2 | + | 1 20 | x |
3 4 | = | - | 7 2 | + | 1 20 | x |
- | 1 20 | x | = | - | 7 2 | − | 3 4 |
- | 1 20 | x | = | - | 17 4 |
17 4 | = | 1 20 | x |
1 20 | x | = | 17 4 |
x | = | 17 4 | ÷ | 1 20 |
= | 17 4 | × | 20 |
= | 17 | × | 5 |
x | = | 85 |