( | 4 | x | + | 40 | ) | ÷ | ( | 5 | x | + | 39 | ) | = | 6 | ÷ | 7 |
方程两边同时乘以: | ( | 5 | x | + | 39 | ) |
( | 4 | x | + | 40 | ) | = | 6 | ÷ | 7 | × | ( | 5 | x | + | 39 | ) |
4 | x | + | 40 | = | 6 | ÷ | 7 | × | ( | 5 | x | + | 39 | ) |
4 | x | + | 40 | = | 6 | ÷ | 7 | × | 5 | x | + | 6 | ÷ | 7 | × | 39 |
4 | x | + | 40 | = | 30 7 | x | + | 234 7 |
4 | x | − | 30 7 | x | = | 234 7 | − | 40 |
- | 2 7 | x | = | 234 7 | − | 40 |
- | 2 7 | x | = | - | 46 7 |
46 7 | = | 2 7 | x |
2 7 | x | = | 46 7 |
x | = | 46 7 | ÷ | 2 7 |
= | 46 7 | × | 7 2 |
= | 23 | × | 1 |
x | = | 23 |