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lim x to 3 ((x^2-9)/(x^2-2x-3)*(x^3+7x^2-21x-27)/(3x^2-11x+6))
lim x to 3 ((x^2-9)/(x^2-2x-3)*(x^3+7x^2-21x-27)/(3x^2-11x+6))
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