3 2 | x | × | 8 | + | 6 5 | x | × | 2 | − | 10 | x | = | 3 2 | x | × | 10 | − | 10 | x | − | 390 |
方程左边 = | 12 | x | + | 12 5 | x | − | 10 | x |
= | 22 5 | x |
22 5 | x | = | 3 2 | x | × | 10 | − | 10 | x | − | 390 |
方程右边 = | 15 | x | − | 10 | x | − | 390 |
= | 5 | x | − | 390 |
22 5 | x | = | 5 | x | − | 390 |
22 5 | x | − | 5 | x | = | - | 390 |
- | 3 5 | x | = | - | 390 |
390 | = | 3 5 | x |
3 5 | x | = | 390 |
x | = | 390 | ÷ | 3 5 |
= | 390 | × | 5 3 |
= | 130 | × | 5 |
x | = | 650 |