Let $f$ and $g$ be continuous functions such that

${\displaystyle \underset{-19}{\overset{-17}{}}}f(x)dx=16,{\displaystyle \underset{-17}{\overset{-1}{}}}f(x)dx=4$

${\displaystyle \underset{14}{\overset{-19}{}}}g(x)dx=20,$ and ${\displaystyle \underset{-1}{\overset{14}{}}}g(x)dx=6$

Evaluate the definite integral, using properties of the definite integral.

${\displaystyle \underset{-19}{\overset{-1}{}}}(6f(x)-2g(x))dx=$

$$

Make sure to show all properties used with proper definite integral notation.