100 | × | 1 2 | + | ( | x | − | 100 | ) | × | 3 5 | = | 13 20 | x |
方程左边 = | 50 | + | ( | x | − | 100 | ) | × | 3 5 |
50 | + | ( | x | − | 100 | ) | × | 3 5 | = | 13 20 | x |
方程左边 = | 50 | + | x | × | 3 5 | − | 100 | × | 3 5 |
= | 50 | + | x | × | 3 5 | − | 60 |
= | - | 10 | + | 3 5 | x |
- | 10 | + | 3 5 | x | = | 13 20 | x |
3 5 | x | − | 13 20 | x | = | 10 |
- | 1 20 | x | = | 10 |
- | 10 | = | 1 20 | x |
1 20 | x | = | - | 10 |
x | = | - | 10 | ÷ | 1 20 |
= | - | 10 | × | 20 |
x | = | - | 200 |