$$\left. \begin{array} { l } { x = 5 } \\ { 2 x + 8 \div 4 } \end{array} \right.$$
$y=12$
$$y=2\times 5+\frac{8}{4}$$
$$y=10+\frac{8}{4}$$
$$y=10+2$$
$$y=12$$
$$x=5$$ $$y=12$$
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