$$\frac{ -1x }{ 2 } =y- \frac{ 13 }{ 2 }$$
$x=13-2y$
$$-x=2y-13$$
$$\frac{-x}{-1}=\frac{2y-13}{-1}$$
$$x=\frac{2y-13}{-1}$$
$$x=13-2y$$
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$y=\frac{13-x}{2}$
$$2y-13=-x$$
$$2y=-x+13$$
$$2y=13-x$$
$$\frac{2y}{2}=\frac{13-x}{2}$$
$$y=\frac{13-x}{2}$$
