# How do we find the midpoint between (-a, -b, -c) and (3a, 3b, 3c)?

$\left({x}_{m} , {y}_{m}\right) = \left(\frac{- a + 3 a}{2} , \frac{- b + 3 b}{2} , \frac{- c + 3 c}{2}\right) = \left(a , b , c\right)$