Answer
$(4,-3,-1)$.
Work Step by Step
The midpoint $M$ of the line segment from $P_1(x_1,y_1,z_1)$ to $P_2(x_2,y_2,z_2)$ is: $(\frac{x_1+x_2}{2},\frac{y_1+y_2}{2},\frac{z_1+z_2}{2})$.
Hence:
$M=(\frac{5+3}{2},\frac{1-7}{2},\frac{-2+0}{2})=(4,-3,-1)$.
