27x3-8y3 = (3x)3-(2y)3 { (a)3-(b)3 = (a-b)(a2 + b2 + ab) }
= (3x-2y)((3x)2 + (2y)2 + (3x)(2y))
= (3x-2y)( 9x2 + 4y2 + 6xy)
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