$$x = \frac { 2 y - 9 } { 2 }$$
$y = \frac{9}{2} = 4\frac{1}{2} = 4.5$
$$x=y-\frac{9}{2}$$
$$y-\frac{9}{2}=x$$
$$y=x+\frac{9}{2}$$
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$x = -\frac{9}{2} = -4\frac{1}{2} = -4.5$
