Solve the system of linear equations if possible. If there is no solution, enter NONE for both $x$ and $y$. If there are infinitely many solutions, enter $x$ for $x$ and an expression in terms of $x$ for $y$ (i.e. solve for $y$).

\begin{cases} 0.5 x - 0.4 y &= 5 \\ 0.7 x + 0.2 y &= -6 \end{cases} $x=$
$y=$