Answer
$\frac{1}{x}$
Work Step by Step
Since we already have common denominators, we can add and simplify the numerators:
$\frac{3}{8x} + \frac{5}{8x} =\frac{3+5}{8x}
= \frac{8}{8x}$
Now we can divide the numerator and denominator by 8 since it is a common factor:
$\frac{8}{8x} = \frac{1}{x}$
