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3(6a+9)=21
We move all terms to the left:
3(6a+9)-(21)=0
We multiply parentheses
18a+27-21=0
We add all the numbers together, and all the variables
18a+6=0
We move all terms containing a to the left, all other terms to the right
18a=-6
a=-6/18
a=-1/3
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