( | 15 | + | x | ) | ÷ | ( | 29 | + | x | ) | = | 3 | ÷ | 5 |
方程两边同时乘以: | ( | 29 | + | x | ) |
( | 15 | + | x | ) | = | 3 | ÷ | 5 | × | ( | 29 | + | x | ) |
15 | + | x | = | 3 | ÷ | 5 | × | ( | 29 | + | x | ) |
15 | + | x | = | 3 | ÷ | 5 | × | 29 | + | 3 | ÷ | 5 | × | x |
15 | + | x | = | 87 5 | + | 3 5 | x |
x | − | 3 5 | x | = | 87 5 | − | 15 |
2 5 | x | = | 87 5 | − | 15 |
2 5 | x | = | 12 5 |
x | = | 12 5 | ÷ | 2 5 |
= | 12 5 | × | 5 2 |
= | 6 | × | 1 |
x | = | 6 |