$$\left. \begin{array} { l } { y = 5 ( x ) = \sqrt { - 2 x + 1 } } \end{array} \right.$$
$x=\frac{y}{5}$
$$5x=y$$
$$\frac{5x}{5}=\frac{y}{5}$$
$$x=\frac{y}{5}$$
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