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Introductory and Intermediate Algebra for College Students 4th
Determine if the given ordered triple is a solution of the system.
$$\begin{aligned}&(2,-1,3)\\&\left\{\begin{aligned}x+y+z &=4 \\x-2 y-z &=1 \\2 x-y-z &=-1\end{aligned}\right.
\end{aligned}$$