Functions f and g are defined by
$f:x \mapsto 2x + 3$ for $x \leqslant 0$,
$g:x \mapsto {x^2} - 6x$ for $x \leqslant 3$.
a) Express ${f^{ - 1}}\left( x \right)$ in terms of $x$ and solve the equation $f\left( x \right) = {f^{ - 1}}\left( x \right)$.
b) On the same diagram sketch the graphs of $y = f\left( x \right)$ and $y = {f^{ - 1}}\left( x \right)$, showing the coordinates of their point of intersection and the relationship between the graphs.
c) Find the set of values of $x$ which satisfy $gf\left( x \right) \leqslant 16$.
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