Find the general solution to the given system.

$-2x_1+6x_2=-4$

$4x_3=-20$

$\left[\begin{array}{c}{x}_1\\ x_2\\ x_3\end{array}\right]=[Ex$: $1-2x_{-}3]$

Enter $1-2x_3$ as: $1-2x_{-}3$

$($Signs should be simplified, so answers

such as $1+-2x_{-}3$ will not be accepted$)$