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9a-5=13-3a
We move all terms to the left:
9a-5-(13-3a)=0
We add all the numbers together, and all the variables
9a-(-3a+13)-5=0
We get rid of parentheses
9a+3a-13-5=0
We add all the numbers together, and all the variables
12a-18=0
We move all terms containing a to the left, all other terms to the right
12a=18
a=18/12
a=1+1/2
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