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Write the System of Equations Represented by the Augmented Matrix [1211201280014]\left[ \begin{array} { c c c | c } 1 & - 2 & 1 & - 12 \\0 & 1 & 2 & 8 \\0 & 0 & 1 & 4\end{array} \right]

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Write the system of equations represented by the augmented matrix. [1211201280014]\left[ \begin{array} { c c c | c } 1 & - 2 & 1 & - 12 \\0 & 1 & 2 & 8 \\0 & 0 & 1 & 4\end{array} \right] __________ Use back substitution to find the solution. __________

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