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-(a+7)=-2-6a
We move all terms to the left:
-(a+7)-(-2-6a)=0
We add all the numbers together, and all the variables
-(a+7)-(-6a-2)=0
We get rid of parentheses
-a+6a-7+2=0
We add all the numbers together, and all the variables
5a-5=0
We move all terms containing a to the left, all other terms to the right
5a=5
a=5/5
a=1
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