Divide -x^3-27 by -x-3.
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(-x)^3 - (3)^3 / (-x-3)
= (-x-3)(x^2+3x+9) / (-x-3)
= x^2 + 3x + 9.
= (-x-3)(x^2+3x+9) / (-x-3)
= x^2 + 3x + 9.
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