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= -4x^2+6xy+6xy+9y^2
= -4x^2+12xy+9y^2
=(-2x-3y)(-4x^2+12xy+9y^2)
=8x^3 -24x^2y -18xy - 18xy^2 + 12x^2y - 36xy^2 - 27y^3
= 8x^3 - 12x^y - 54xy^2 - 27y^3