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Solve the Pair of Linear Equations by Addition 9x6y=276x+y=21\begin{array} { c } 9 x - 6 y = 27 \\6 x + y = 21\end{array}

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Solve the pair of linear equations by addition. 9x6y=276x+y=21\begin{array} { c } 9 x - 6 y = 27 \\6 x + y = 21\end{array}

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