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2a+3(a+1)=9
We move all terms to the left:
2a+3(a+1)-(9)=0
We multiply parentheses
2a+3a+3-9=0
We add all the numbers together, and all the variables
5a-6=0
We move all terms containing a to the left, all other terms to the right
5a=6
a=6/5
a=1+1/5
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