(x+30):(5x-30)=3:5

问题描述:

(x+30):(5x-30)=3:5

(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