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.
\(\left\{\begin{array}{l}6 x+y+20 z=-12 \\ x-y=6 \\ y+3 z=-7 \\\end{array}ight.\)
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