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7a-9=3-a
We move all terms to the left:
7a-9-(3-a)=0
We add all the numbers together, and all the variables
7a-(-1a+3)-9=0
We get rid of parentheses
7a+1a-3-9=0
We add all the numbers together, and all the variables
8a-12=0
We move all terms containing a to the left, all other terms to the right
8a=12
a=12/8
a=1+1/2
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