Evaluate: [−9−18−27−3−694−8−12]+[−510−156−1218−7−14−21]\begin{bmatrix} -9 & -18 & -27\\ -3 & -6 & 9\\ 4 & -8 & -12\\ \end{bmatrix} + \begin{bmatrix} -5 & 10 & -15\\ 6 & -12 & 18\\ -7 & -14 & -21\\ \end{bmatrix}

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