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3(2+a)=21
We move all terms to the left:
3(2+a)-(21)=0
We add all the numbers together, and all the variables
3(a+2)-21=0
We multiply parentheses
3a+6-21=0
We add all the numbers together, and all the variables
3a-15=0
We move all terms containing a to the left, all other terms to the right
3a=15
a=15/3
a=5
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