how to solve this system of equations using gaussian?

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Please explain it step by step. I couldn't do it on my own. tried $3$ times, still got no solution to it. but it has infinitely many solutions. $$ \begin{cases}2y+z+4v= -5\\ 2x-3y-z+2w+3v= 4\\ 4x-4y-z+4w+11v= 4\\ 2x-5y-2z+2w-v= 9\end{cases}$$