$$16x+12+8=2(2x+18)$$
$x = \frac{4}{3} = 1\frac{1}{3} \approx 1.333333333$
$$16x+20=2\left(2x+18\right)$$
$$16x+20=4x+36$$
$$16x+20-4x=36$$
$$12x+20=36$$
$$12x=36-20$$
$$12x=16$$
$$x=\frac{16}{12}$$
$$x=\frac{4}{3}$$
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