$$12x-3(x-2)=5(x+4)$$
$x = \frac{7}{2} = 3\frac{1}{2} = 3.5$
$$12x-3x+6=5\left(x+4\right)$$
$$9x+6=5\left(x+4\right)$$
$$9x+6=5x+20$$
$$9x+6-5x=20$$
$$4x+6=20$$
$$4x=20-6$$
$$4x=14$$
$$x=\frac{14}{4}$$
$$x=\frac{7}{2}$$
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