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Find a function $f(x)$ so that $h(x) = (g \circ f)(x)$ given that

$g(x) = \displaystyle 3 x^3 + 10 x^2 + 3 x - 6$

and

$h(x) = \displaystyle 3 (8 x - 2) ^3 + 10 (8 x - 2)^2 + 3 (8 x - 2) - 6$ .

$f(x) =$