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-2(13+6a)=58
We move all terms to the left:
-2(13+6a)-(58)=0
We add all the numbers together, and all the variables
-2(6a+13)-58=0
We multiply parentheses
-12a-26-58=0
We add all the numbers together, and all the variables
-12a-84=0
We move all terms containing a to the left, all other terms to the right
-12a=84
a=84/-12
a=-7
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