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(x+10)/(y+10)=2/3.....(2)
de (2)
3(x+10)=2(y+10)
3x+30=2y+20
3x=2y -10.......(3)
de (1)
x=3y/5.....(4)
(4) en (3)
3(3y/5)= 2y-10
9y/5= 2y-10
9y=10y-50
50=y
en (4)
x=3y/5
x=(3*50)/5
x=30