Solve the systems in Problems (27-38) by the addition method. (left{begin{array}{l}s+t=12 s-2 t=-4end{array}ight.)

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

\(\left\{\begin{array}{l}s+t=12 \\ s-2 t=-4\end{array}ight.\)

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