$$2x-12=4y$$
$x=2\left(y+3\right)$
$$2x=4y+12$$
$$\frac{2x}{2}=\frac{4y+12}{2}$$
$$x=\frac{4y+12}{2}$$
$$x=2y+6$$
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$y=\frac{x-6}{2}$
$$4y=2x-12$$
$$\frac{4y}{4}=\frac{2x-12}{4}$$
$$y=\frac{2x-12}{4}$$
$$y=\frac{x}{2}-3$$
