$$8x-4=3(x+2)+7$$
$x = \frac{17}{5} = 3\frac{2}{5} = 3.4$
$$8x-4=3x+6+7$$
$$8x-4=3x+13$$
$$8x-4-3x=13$$
$$5x-4=13$$
$$5x=13+4$$
$$5x=17$$
$$x=\frac{17}{5}$$
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