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24=3+3a
We move all terms to the left:
24-(3+3a)=0
We add all the numbers together, and all the variables
-(3a+3)+24=0
We get rid of parentheses
-3a-3+24=0
We add all the numbers together, and all the variables
-3a+21=0
We move all terms containing a to the left, all other terms to the right
-3a=-21
a=-21/-3
a=+7
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