$$x=13-2y$$
$y=\frac{13-x}{2}$
$$13-2y=x$$
$$-2y=x-13$$
$$\frac{-2y}{-2}=\frac{x-13}{-2}$$
$$y=\frac{x-13}{-2}$$
$$y=\frac{13-x}{2}$$
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$x=13-2y$