3 4 | = | 1 2 | + | ( | x | − | 49 | ) | × | 1 20 | − | 15 | × | 1 20 |
方程右边 = | 1 2 | + | ( | x | − | 49 | ) | × | 1 20 | − | 3 4 |
= | - | 1 4 | + | ( | x | − | 49 | ) | × | 1 20 |
3 4 | = | - | 1 4 | + | ( | x | − | 49 | ) | × | 1 20 |
方程右边 = | - | 1 4 | + | x | × | 1 20 | − | 49 | × | 1 20 |
= | - | 1 4 | + | x | × | 1 20 | − | 49 20 |
= | - | 27 10 | + | 1 20 | x |
3 4 | = | - | 27 10 | + | 1 20 | x |
- | 1 20 | x | = | - | 27 10 | − | 3 4 |
- | 1 20 | x | = | - | 69 20 |
69 20 | = | 1 20 | x |
1 20 | x | = | 69 20 |
x | = | 69 20 | ÷ | 1 20 |
= | 69 20 | × | 20 |
= | 69 | × | 1 |
x | = | 69 |