Midpoint formula is ([tex](\frac{x₁+x₂}{2},\frac{y₁+y₂}{2})[/tex]
So your equation would be set up as ([tex](\frac{-4+7}{2},\frac{-3+-5}{2})[/tex]
Which reduces down to ([tex](\frac{3}{2},\frac{-8}{2})[/tex]
And your answer after dividing is (1.5,-4)