$$2x+1y=5$$
$x=\frac{5-y}{2}$
$$2x=5-y$$
$$\frac{2x}{2}=\frac{5-y}{2}$$
$$x=\frac{5-y}{2}$$
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$y=5-2x$
$$1y=5-2x$$
$$y=-2x+5$$