(x+1)/2 = (y+3)/4 + (x+y)/5,10(x+1) = 5(y+3) + 4(x+y),6x = 9y + 5,(3x + 2y + 1)/(x + 2y + 3)= (6x + 4y + 2)/(6x + 12y + 18)*(6/2)= 3[9y + 5 + 4y + 2]/[9y + 5 + 12y + 18]= 3[13y + 7]/[21y + 23]