## Question

###### Solve each system. $$ \left\{\begin{array}{r} {x+2 y-z=5} \\ {6 x+y+z=7} \\ {2 x+4 y-2 z=5} \end{array}\right. $$

Solve each system. $$ \left\{\begin{array}{r} {x+2 y-z=5} \\ {6 x+y+z=7} \\ {2 x+4 y-2 z=5} \end{array}\right. $$

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