The following table lists the value of functions $g$ and $h$, and of their derivatives, $g'$ and $h'$, for $x=3$.
$x$ | $g(x)$ | $h(x)$ | $g'(x)$ | $h'(x)$
:-: | :-: | :-: | :-: | :-:
$3$ | $~~9$ | $~~~0$ | $-15$ | $~~~6$
Let function $G$ be defined as $G(x)=2g(x)-h(x)+8$.
$G'(3)=$ [[☃ numeric-input 1]]