If $\alpha =\begin{bmatrix} 1 & -6 \\ 4 & 8 \end{bmatrix}$ and $\beta =\begin{bmatrix} 2 & 4 \\ 8 & 3 \end{bmatrix},$ what is the value of ${ 3\alpha }-{ 2\beta }?$

Express your answer as the sum of all elements in the final matrix.

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