factorise the 27 x cube + 8 y cube - 3 X + 2 y whole cube
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27x³+8y³-(3x+2y)³
=> (3x)³+(2y)³-(3x+2y)³
=> (3x+2y)(9x²-6xy+4y²)-(3x+2y)³
=> (3x+2y)[9x²-6xy+4y²-(3x+2y)²]
=> (3x+2y)(9x²-6xy+4y²-9x²-4y²-12xy)
=> -18xy(3x+2y)
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