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