(4x+20)/4=-2+(6x-20)/5x

问题描述:

(4x+20)/4=-2+(6x-20)/5x

(4x+20)/4=-2+(6x-20)/5x
20x^2+100x=-40x+24x-80
20x^2+116x+80=0
5x^2+29x+20=0
x=-5,或x=-4/5