$$9x-4=3(x-4)$$
$x = -\frac{4}{3} = -1\frac{1}{3} \approx -1.333333333$
$$9x-4=3x-12$$
$$9x-4-3x=-12$$
$$6x-4=-12$$
$$6x=-12+4$$
$$6x=-8$$
$$x=\frac{-8}{6}$$
$$x=-\frac{4}{3}$$
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