5 | ( | ( | 3 2 | x | − | 30 | ) | × | 4 5 | − | x | ) | = | ( | 3 2 | x | − | x | ) | + | 130 |
方程左边 = | 5 | ( | 3 2 | x | − | 30 | ) | × | 4 5 | − | 5 | x |
= | 4 | ( | 3 2 | x | − | 30 | ) | − | 5 | x |
= | 4 | × | 3 2 | x | − | 4 | × | 30 | − | 5 | x |
= | 6 | x | − | 120 | − | 5 | x |
= | 1 | x | − | 120 |
1 | x | − | 120 | = | ( | 3 2 | x | − | x | ) | + | 130 |
方程右边 = | 3 2 | x | − | x | + | 130 |
= | 1 2 | x | + | 130 |
1 | x | − | 120 | = | 1 2 | x | + | 130 |
1 | x | − | 1 2 | x | = | 130 | + | 120 |
1 2 | x | = | 130 | + | 120 |
1 2 | x | = | 250 |
x | = | 250 | ÷ | 1 2 |
= | 250 | × | 2 |
x | = | 500 |