(x+30):(5x-30)=3:5
问题描述:
(x+30):(5x-30)=3:5
答
(x+30):(5x-30)=3:5
5(x+30)=3(5x-30)
5x+150=15x-90
5x-15x=-90-150
-10x=-240
x=-240/-10
x=24