( | x | + | 17 | ) | ÷ | 5 | − | ( | 3 | x | − | 7 | ) | ÷ | 4 | = | - | 2 |
方程左边 = | x | × | 1 5 | + | 17 | × | 1 5 | − | ( | 3 | x | − | 7 | ) | × | 1 4 |
= | x | × | 1 5 | + | 17 5 | − | ( | 3 | x | − | 7 | ) | × | 1 4 |
= | 1 5 | x | + | 17 5 | − | 3 | x | × | 1 4 | + | 7 | × | 1 4 |
= | 1 5 | x | + | 17 5 | − | 3 4 | x | + | 7 4 |
= | - | 11 20 | x | + | 103 20 |
- | 11 20 | x | + | 103 20 | = | - | 2 |
- | 11 20 | x | = | - | 2 | − | 103 20 |
- | 11 20 | x | = | - | 143 20 |
143 20 | = | 11 20 | x |
11 20 | x | = | 143 20 |
x | = | 143 20 | ÷ | 11 20 |
= | 143 20 | × | 20 11 |
= | 13 | × | 1 |
x | = | 13 |