$$\left. \begin{array} { l } { 3 n - 2 y = - 6 \rightarrow 0 } \\ { n + 2 y = 10 - 70 } \end{array} \right.$$
$y\in \mathrm{C}$
$n=\frac{2\left(y-3\right)}{3}$
$y\in \mathrm{R}$
$n=\frac{2\left(y-3\right)}{3}$
