$$\pi x+y=9$$
$x=-\frac{y-9}{\pi }$
$$\pi x=9-y$$
$$\frac{\pi x}{\pi }=\frac{9-y}{\pi }$$
$$x=\frac{9-y}{\pi }$$
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$y=9-\pi x$
$$y=9-\pi x$$
$$y=-\pi x+9$$
