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-18=3a+3
We move all terms to the left:
-18-(3a+3)=0
We get rid of parentheses
-3a-3-18=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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