BY TAKING A=3/7,B=3/7 AND C=3/7 VERIFY A+(B+C)= (A+B)+C.
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A+(B+C)= (A+B)+C
3/7+(3/7+3/7)= (3/7+3/7)+3/7
3/7+6/7= 6/7+3/7
9/7=9/7
Therefore A+(B+C)=(A+B)+C
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