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Question

If ab+c=bc+a=ca+b , prove that a(bc)+b(ca)+c(ab)=0

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Solution

Let ab+c=bc+a=ca+b=k
a=k(b+c),b=k(c+a),c=k(a+b)
a(bc)+b(ca)+c(ab)=k(b2c2)+k(c2a2)+k(a2b2)=0

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