( | 18 | + | x | ) | ÷ | ( | 48 | + | x | ) | = | 2 | ÷ | 5 |
方程两边同时乘以: | ( | 48 | + | x | ) |
( | 18 | + | x | ) | = | 2 | ÷ | 5 | × | ( | 48 | + | x | ) |
18 | + | x | = | 2 | ÷ | 5 | × | ( | 48 | + | x | ) |
18 | + | x | = | 2 | ÷ | 5 | × | 48 | + | 2 | ÷ | 5 | × | x |
18 | + | x | = | 96 5 | + | 2 5 | x |
x | − | 2 5 | x | = | 96 5 | − | 18 |
3 5 | x | = | 96 5 | − | 18 |
3 5 | x | = | 6 5 |
x | = | 6 5 | ÷ | 3 5 |
= | 6 5 | × | 5 3 |
= | 2 | × | 1 |
x | = | 2 |