![\left[\begin{array}{ccc}-6-(-5)&-4-5\\6-(-4)&0-(-1)\\6-6&4-(-4)\end{array}\right]](/tpl/images/0346/0152/319a8.png)
![\left[\begin{array}{ccc}-6+5&-4-5\\6+4&0+1\\6-6&4+4\end{array}\right]](/tpl/images/0346/0152/3ea54.png)
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