( | 1 | ÷ | 4 | × | x | + | 7 | ÷ | 10 | × | x | + | 1 | ) | − | ( | x | + | 2 | ) | = | 2 |
方程左边 = | 1 | ÷ | 4 | × | x | + | 7 | ÷ | 10 | × | x | + | 1 | − | ( | x | + | 2 | ) |
= | 1 4 | x | + | 7 10 | x | + | 1 | − | ( | x | + | 2 | ) |
= | 19 20 | x | + | 1 | − | ( | x | + | 2 | ) |
= | 19 20 | x | + | 1 | − | x | − | 2 |
= | - | 1 20 | x | − | 1 |
- | 1 20 | x | − | 1 | = | 2 |
- | 1 20 | x | = | 2 | + | 1 |
- | 1 20 | x | = | 3 |
- | 3 | = | 1 20 | x |
1 20 | x | = | - | 3 |
x | = | - | 3 | ÷ | 1 20 |
= | - | 3 | × | 20 |
x | = | - | 60 |