$$\left. \begin{array} { l } { 2 y = 4 x - 7 } \end{array} \right.$$
$x=\frac{y}{2}+\frac{7}{4}$
$$4x-7=2y$$
$$4x=2y+7$$
$$\frac{4x}{4}=\frac{2y+7}{4}$$
$$x=\frac{2y+7}{4}$$
$$x=\frac{y}{2}+\frac{7}{4}$$
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