x=7/15+7/30+4/5=(7*2+7+4*6)/30=45/30=3/2=1 1/2
y=2-1/3-1/2=(12-2-3)/6=7/6= 1 1/6
x/y=1 1/2:1 1/6=3/2:7/6=(3*6)/2*7=18/14=
=9/7=1 2/7
