factories x3+216y3+8z3-36xyz
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x3+(6y)3+(2z)3-3(x)(6y)(2z)
=(x+6y+2z)(x2+(6y)2+(2z)2-(6xy)-(12yz)-(2zx))
=(x+6y+2z)(x2+(6y)2+(2z)2-(6xy)-(12yz)-(2zx))
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