$$5x+4y=8$$
$x=\frac{8-4y}{5}$
$$5x=8-4y$$
$$\frac{5x}{5}=\frac{8-4y}{5}$$
$$x=\frac{8-4y}{5}$$
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$y=-\frac{5x}{4}+2$
$$4y=8-5x$$
$$\frac{4y}{4}=\frac{8-5x}{4}$$
$$y=\frac{8-5x}{4}$$
$$y=-\frac{5x}{4}+2$$
