Matrix Operations

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Question #7.

$Simplify $ \begin{bmatrix} -6 \\ -1 \\ -2 \\ -2 \end{bmatrix} + \begin{bmatrix} -4 \\ -5 \\ -6 \\ 4 \end{bmatrix} + \begin{bmatrix} 4 \\ 0 \\ 4 \\ 6 \end{bmatrix} $$

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