Question 828897
The expression in that form cannot accept x at 3.


First simplify numerator:
{{{(-6x^2-2x+6)/(x-3)}}}
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Divide numerator and denom by x:
{{{(1/x)(-6x^2-2x+6)/((1/x)(x-3))}}}


{{{(-6x-2+6/x)/(1+3/x)}}}
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NOW What happens if x=3 ?  Try it and find the result.