![3 \left[\begin{array}{cc}6&4\\1&-3\end{array}\right] -\left[\begin{array}{cc}-2&8\\7&7\end{array}\right]=\left[\begin{array}{cc}3(6)-(-2)&3(4)-8\\3(1)-7&3(-3)-7\end{array}\right]=\left[\begin{array}{cc}20&4\\-4&-16\end{array}\right]](/tpl/images/0684/2562/8ee2a.png)
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Fill in the missing numbers.
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