$$y=2x+1..PARa.1 < x < 3$$
$x=\frac{y-1}{2}$
$$2x+1=y$$
$$2x=y-1$$
$$\frac{2x}{2}=\frac{y-1}{2}$$
$$x=\frac{y-1}{2}$$
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$y=2x+1$
