Answer
$-4a^2+12-\frac{5}{a}$
Work Step by Step
$\frac{-12a^3+36a-15}{3a}$
$=-12a^3(\frac{1}{3a})+36a(\frac{1}{3a})-15(\frac{1}{3a})$
$=-4a^2+12-\frac{5}{a}$
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