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