You are given the four points in the plane $A=(-5,-5),B=(-1,3),C=(3,-6)$ and $D=(6,7).$ The graph of the function $f(x)$ consists of the three line segments $AB,BC$ and $C{D}^{}.$

Find the following integral by interpreting it in terms of sums and$/$or differences of areas of elementary figures from drawing the graph $f(x).$

${\displaystyle \underset{-5}{\overset{6}{}}}f(x)dx=$