(2/3 - 1/2)+ 5/6=4/6-3/6+5/6=6/6=1
(-7/30+1/5)+(-5/6)=-7/30+6/30-25/30=-26/30=-13/15
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(2/3 - 1/2)+ 5/6=4/6-3/6+5/6=6/6=1
(-7/30+1/5)+(-5/6)=-7/30+6/30-25/30=-26/30=-13/15