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3a+5=21+a
We move all terms to the left:
3a+5-(21+a)=0
We add all the numbers together, and all the variables
3a-(a+21)+5=0
We get rid of parentheses
3a-a-21+5=0
We add all the numbers together, and all the variables
2a-16=0
We move all terms containing a to the left, all other terms to the right
2a=16
a=16/2
a=8
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