( | 7 | x | + | 70 | ) | ÷ | ( | 3 | x | + | 70 | ) | = | 7 | ÷ | 4 |
方程两边同时乘以: | ( | 3 | x | + | 70 | ) |
( | 7 | x | + | 70 | ) | = | 7 | ÷ | 4 | × | ( | 3 | x | + | 70 | ) |
7 | x | + | 70 | = | 7 | ÷ | 4 | × | ( | 3 | x | + | 70 | ) |
7 | x | + | 70 | = | 7 | ÷ | 4 | × | 3 | x | + | 7 | ÷ | 4 | × | 70 |
7 | x | + | 70 | = | 21 4 | x | + | 245 2 |
7 | x | − | 21 4 | x | = | 245 2 | − | 70 |
7 4 | x | = | 245 2 | − | 70 |
7 4 | x | = | 105 2 |
x | = | 105 2 | ÷ | 7 4 |
= | 105 2 | × | 4 7 |
= | 15 | × | 2 |
x | = | 30 |