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6(a+3)=21-3(1-2a
We move all terms to the left:
6(a+3)-(21-3(1-2a)=0
We add all the numbers together, and all the variables
6(a+3)-(21-3(-2a+1)=0
We multiply parentheses
6a-(21-3(-2a+1)+18=0
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