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15a-3=-3a+33
We move all terms to the left:
15a-3-(-3a+33)=0
We get rid of parentheses
15a+3a-33-3=0
We add all the numbers together, and all the variables
18a-36=0
We move all terms containing a to the left, all other terms to the right
18a=36
a=36/18
a=2
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