$$\left. \begin{array} { l } { \quad y = - 9 x + 12 } \end{array} \right.$$
$x=-\frac{y}{9}+\frac{4}{3}$
$$-9x+12=y$$
$$-9x=y-12$$
$$\frac{-9x}{-9}=\frac{y-12}{-9}$$
$$x=\frac{y-12}{-9}$$
$$x=-\frac{y}{9}+\frac{4}{3}$$
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