x | × | 70 100 | + | ( | 160 | − | x | ) | × | 90 100 | = | 160 | × | 85 100 |
方程左边 = | 70 100 | x | + | 160 | × | 90 100 | − | x | × | 90 100 |
= | 70 100 | x | + | 144 | − | x | × | 90 100 |
= | - | 1 5 | x | + | 144 |
- | 1 5 | x | + | 144 | = | 160 | × | 85 100 |
方程右边 = | 136 |
- | 1 5 | x | + | 144 | = | 136 |
- | 1 5 | x | = | 136 | − | 144 |
- | 1 5 | x | = | - | 8 |
8 | = | 1 5 | x |
1 5 | x | = | 8 |
x | = | 8 | ÷ | 1 5 |
= | 8 | × | 5 |
x | = | 40 |