If P=-8/7,Q=3/4,R=-12/15 Find P*(Q*R)=(P*Q)*R
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p(Q*R)=(p*Q)R
-8/7(3/4*-12/15)=(-8/7*3/4)(-12/15)
-8/7*-36/60=-24/28*-12/15
288/420=288/420
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