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