3)=1/6-5/12+7/12=2/6+1/6=3/6=1/2
6)=-5/8-5/8+1=-1 1/4+1=-1/4
9)=-2/9+1+8/9=1 6/9=1 2/3
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3)=1/6-5/12+7/12=2/6+1/6=3/6=1/2
6)=-5/8-5/8+1=-1 1/4+1=-1/4
9)=-2/9+1+8/9=1 6/9=1 2/3