Solve the systems in Problems 27-54 by solving the corresponding matrix equation with an inverse, if possible.

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Solve the systems in Problems 27-54 by solving the corresponding matrix equation with an inverse, if possible.

\(\left\{\begin{array}{l}6 x+y+20 z=27 \\ x-y=0 \\ y+3 z=4\end{array}ight.\)

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