3 and 1/2=3 and 2/4 3 and 2/4-9 and 3/4=3-9+2/4-3/4=-6-1/4=-6 and 1/4 now divide by -2 and 1/2 negative divided by negative is positive also dividingn fractions, invert secondn one and multiply them (a/b)/(c/d)=(a/b)(d/c)=(ad)/(bc) so convert to improper 6 and 1/4=6+1/4=24/4+1/4=25/4 2 and 1/2=2+1/2=4/2+1/2=5/2