Answer
$-3x^2+x-\frac{4}{x^3}$
Work Step by Step
$\frac{-9x^5+3x^4-12}{3x^3}$
$=-9x^5(\frac{1}{3x^3})+3x^4(\frac{1}{3x^3})-12(\frac{1}{3x^3})$
$=-3x^2+x-\frac{4}{x^3}$
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