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5a-4a=1a+12a
We move all terms to the left:
5a-4a-(1a+12a)=0
We add all the numbers together, and all the variables
5a-4a-(+13a)=0
We add all the numbers together, and all the variables
a-(+13a)=0
We get rid of parentheses
a-13a=0
We add all the numbers together, and all the variables
-12a=0
a=0/-12
a=0
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