$$x-7y=49$$
$y=\frac{x-49}{7}$
$$-7y=49-x$$
$$\frac{-7y}{-7}=\frac{49-x}{-7}$$
$$y=\frac{49-x}{-7}$$
$$y=\frac{x}{7}-7$$
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$x=7\left(y+7\right)$
$$x=49+7y$$
