Answer
$\displaystyle \frac{a}{c}$
Work Step by Step
Fundamental Principle of Fractions:
The value of a fraction does not change if both the numerator and the
denominator are divided (or multiplied) by the same nonzero number.
So, $ \displaystyle \frac{a\cdot c}{b\cdot c}=\frac{a}{c}.$
