Question 648538
Let M be the midpoint. For (x1,y1) and (x2,y2)

M = ((x1+x2)/2 , (y1+y2)/2)
Or in English, the halfway coordinate between the x coordinates and the halfway coordinate of the y coordinates put together into a point.

M = ((-5+1)/2 , (6+7)/2)
M = (-4/2, 13/2)
M = (-2, 13/2)  or (-2,6.5)