$$\left. \begin{array} { l } { \{ y = x + 6 , } \\ { y = 3 x ; } \end{array} \right.$$
$x=\frac{y}{3}$
$$3x=y$$
$$\frac{3x}{3}=\frac{y}{3}$$
$$x=\frac{y}{3}$$
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