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2a+(a+3)=30
We move all terms to the left:
2a+(a+3)-(30)=0
We get rid of parentheses
2a+a+3-30=0
We add all the numbers together, and all the variables
3a-27=0
We move all terms containing a to the left, all other terms to the right
3a=27
a=27/3
a=9
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