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Find $7\begin{pmatrix} -3 & -15 & -12 \\ -28 & 15 & 6 \\ 10 & 14 & 2 \\ 17 & -18 & 4 \end{pmatrix} + 2\begin{pmatrix} 26 & -3 & 22 \\ 26 & -1 & -2 \\ -30 & 4 & 24 \\ -10 & -20 & 12 \end{pmatrix}-7\begin{pmatrix} 2 & 15 & 26 \\ -14 & -4 & -10 \\ 17 & 25 & -23 \\ 2 & 25 & 6 \end{pmatrix}-2\begin{pmatrix} 12 & -15 & 26 \\ -22 & -6 & -13 \\ 13 & -9 & 6 \\ -17 & -5 & 24 \end{pmatrix}$.