$$\left. \begin{array} { l } { 3 x - y = 7 } \\ { \text { L e d s s o l v \right.$$
$x=\frac{y+7}{3}$
$$3x=7+y$$
$$3x=y+7$$
$$\frac{3x}{3}=\frac{y+7}{3}$$
$$x=\frac{y+7}{3}$$
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