(a+b+c)3-(b+c-a)3-(c+a-b)3-(a+b-c)3=?
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Step-by-step explanation:
3a+3b+3c-3b-3c+3a-3c-3a+3b-3a-3b+3c
=3a+3a-3a-3a+3b-3b+3b-3b+3c-3c-3c+3c
=0+0+0+0
=0
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