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-8a-5a=-7a-6a
We move all terms to the left:
-8a-5a-(-7a-6a)=0
We add all the numbers together, and all the variables
-8a-5a-(-13a)=0
We add all the numbers together, and all the variables
-13a-(-13a)=0
We get rid of parentheses
-13a+13a=0
We add all the numbers together, and all the variables
=0
a=0/1
a=0
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