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6=-7+a
We move all terms to the left:
6-(-7+a)=0
We add all the numbers together, and all the variables
-(a-7)+6=0
We get rid of parentheses
-a+7+6=0
We add all the numbers together, and all the variables
-1a+13=0
We move all terms containing a to the left, all other terms to the right
-a=-13
a=-13/-1
a=+13
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