Answer
$50x-6a+200ax.$
Work Step by Step
We divide each term of the polynomial by the monomial as follows
$$
\frac{3.5ax^2 - 0.42a^2x + 14a^2x^2}{0.07ax }= \frac{3.5ax^2 }{0.07ax }+ \frac{ - 0.42a^2x }{0.07ax }+ \frac{ 14a^2x^2}{0.07ax } \\
=50x-6a+200ax.
$$
