Answer
$\left( \dfrac{1}{2},\dfrac{1}{7} \right)$
Work Step by Step
Using the Midpoint Formula, $\left( \dfrac{x_1+x_2}{2},\dfrac{y_1+y_2}{2} \right)$, then the midpoint between the given points is
\begin{array}{l}
\left( \dfrac{\frac{3}{4}-\left(-\frac{1}{4} \right)}{2},\dfrac{-\frac{1}{7}-\left(-\frac{3}{7} \right)}{2} \right)
\\\\=
\left( \dfrac{\frac{4}{4}}{2},\dfrac{\frac{2}{7}}{2} \right)
\\\\=
\left( \dfrac{1}{2},\dfrac{1}{7} \right)
.\end{array}