## Question

###### Find all solutions of each system. $$\left\{\begin{aligned} x+y+z+w &=4 \\ x-2 y-z-w &=3 \\ 2 x-y+z-w &=2 \\ x-y+2 z-2 w &=-7 \end{aligned}\right.$$

Find all solutions of each system. $$\left\{\begin{aligned} x+y+z+w &=4 \\ x-2 y-z-w &=3 \\ 2 x-y+z-w &=2 \\ x-y+2 z-2 w &=-7 \end{aligned}\right.$$

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