27a^3 - b^3 +c^3 +9abc
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hiilsjhwsiwosisvdhdhd
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Step-by-step explanation:
it is solved by identity
a3 + b3 +c3 +3abc =(a +b +c) (a2 +b2+c2 + 2ab +2bc+ 2ac)
(3a -b+c) (9a2 + b2 +c2 +6ab+ 2bc +6ac)
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