Solve the systems in Problems (27-38) by the addition method. (left{begin{array}{l}x+y=6 x-2 y=12end{array}ight.)

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Solve the systems in Problems \(27-38\) by the addition method.

\(\left\{\begin{array}{l}x+y=6 \\ x-2 y=12\end{array}ight.\)

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