$$8-2x=4x-18$$
$x = \frac{13}{3} = 4\frac{1}{3} \approx 4.333333333$
$$8-2x-4x=-18$$
$$8-6x=-18$$
$$-6x=-18-8$$
$$-6x=-26$$
$$x=\frac{-26}{-6}$$
$$x=\frac{13}{3}$$
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