(x-2.6)/5=(x+5-2.6)/7.5怎么算?
问题描述：
(x-2.6)/5=(x+5-2.6)/7.5怎么算?
答
左右同乘 5*7.5
7.5（x-2.6）= 5*（x+5-2.6）
7.5x -7.5*2.6 = 5x + 5*5 - 5*2.6
7.5x - 5x = 5*5-5*2.6+7.5*2.6
2.5x = 25 + 2.6*2.5
x = 10+2.6
x = 12.6