x | ( | 50 | − | 42 | ) | − | 60000 | = | x | ( | 50 | − | 40 | ) | − | 90000 |
方程左边 = | x | × | 50 | − | x | × | 42 | − | 60000 |
= | 8 | x | − | 60000 |
8 | x | − | 60000 | = | x | ( | 50 | − | 40 | ) | − | 90000 |
方程右边 = | x | × | 50 | − | x | × | 40 | − | 90000 |
= | 10 | x | − | 90000 |
8 | x | − | 60000 | = | 10 | x | − | 90000 |
8 | x | − | 10 | x | = | - | 90000 | + | 60000 |
- | 2 | x | = | - | 90000 | + | 60000 |
- | 2 | x | = | - | 30000 |
30000 | = | 2 | x |
2 | x | = | 30000 |
x | = | 30000 | ÷ | 2 |
= | 30000 | × | 1 2 |
= | 15000 | × | 1 |
x | = | 15000 |