$$\left. \begin{array} { l } { \quad ( 3 x - 2 y ) = ( x - y ) } \end{array} \right.$$
$x=\frac{y}{2}$
$$3x-2y-x=-y$$
$$2x-2y=-y$$
$$2x=-y+2y$$
$$2x=y$$
$$\frac{2x}{2}=\frac{y}{2}$$
$$x=\frac{y}{2}$$
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