Answer
$-3a^2+2a-4.$
Work Step by Step
We divide each term of the polynomial by the monomial as follows
$$
\frac{27a^3 - 18a^2 + 36a}{-9a }= \frac{27a^3 }{-9a }+ \frac{ - 18a^2 }{-9a }+ \frac{ 36a}{-9a }\\
=-3a^2+2a-4.
$$
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