(x+3)/2-(0.4x-1)/0.5=-2.5

问题描述:

(x+3)/2-(0.4x-1)/0.5=-2.5

x+3-(0.4x-1)×4=-5
x+3-1.6x+4=-5
-0.6x+7+5=0
0.6x=12
x=20