![\left[\begin{array}{ccc}6&4\\2&6\\\end{array}\right]](/tpl/images/1397/2668/31bbc.png)
+ ![\left[\begin{array}{ccc}1&-1\\2a&-6\\\end{array}\right]](/tpl/images/1397/2668/e2bdc.png)
( add corresponding elements )![\left[\begin{array}{ccc}7&3\\2+2a&0\\\end{array}\right]](/tpl/images/1397/2668/e9b0e.png)
![\left[\begin{array}{ccc}5&b\\a&0\\\end{array}\right]](/tpl/images/1397/2668/cf046.png)
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