( | x | − | 30 | ) | ( | - | 2 | + | 160 | ) | = | 0 |
方程左边 = | x | ( | - | 2 | + | 160 | ) | − | 30 | ( | - | 2 | + | 160 | ) |
= | - | x | × | 2 | + | x | × | 160 | − | 30 | ( | - | 2 | + | 160 | ) |
= | 158 | x | − | 30 | ( | - | 2 | + | 160 | ) |
= | 158 | x | + | 30 | × | 2 | − | 30 | × | 160 |
= | 158 | x | + | 60 | − | 4800 |
= | 158 | x | − | 4740 |
158 | x | − | 4740 | = | 0 |
158 | x | = | 0 | + | 4740 |
158 | x | = | 4740 |
x | = | 4740 | ÷ | 158 |
= | 4740 | × | 1 158 |
= | 30 | × | 1 |
x | = | 30 |