( | 7 5 | + | 1 5 | ) | ( | x | − | 4 | ) | = | 7 5 | x |
方程左边 = | 7 5 | ( | x | − | 4 | ) | + | 1 5 | ( | x | − | 4 | ) |
= | 7 5 | x | − | 7 5 | × | 4 | + | 1 5 | ( | x | − | 4 | ) |
= | 7 5 | x | − | 28 5 | + | 1 5 | ( | x | − | 4 | ) |
= | 7 5 | x | − | 28 5 | + | 1 5 | x | − | 1 5 | × | 4 |
= | 7 5 | x | − | 28 5 | + | 1 5 | x | − | 4 5 |
= | 8 5 | x | − | 32 5 |
8 5 | x | − | 32 5 | = | 7 5 | x |
8 5 | x | − | 7 5 | x | = | 32 5 |
1 5 | x | = | 32 5 |
x | = | 32 5 | ÷ | 1 5 |
= | 32 5 | × | 5 |
= | 32 | × | 1 |
x | = | 32 |