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9a-3=+4a-a
We move all terms to the left:
9a-3-(+4a-a)=0
We add all the numbers together, and all the variables
9a-(+3a)-3=0
We get rid of parentheses
9a-3a-3=0
We add all the numbers together, and all the variables
6a-3=0
We move all terms containing a to the left, all other terms to the right
6a=3
a=3/6
a=1/2
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