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6a-9a=8a+5a
We move all terms to the left:
6a-9a-(8a+5a)=0
We add all the numbers together, and all the variables
6a-9a-(+13a)=0
We add all the numbers together, and all the variables
-3a-(+13a)=0
We get rid of parentheses
-3a-13a=0
We add all the numbers together, and all the variables
-16a=0
a=0/-16
a=0
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