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3a-27=3(a-9)
We move all terms to the left:
3a-27-(3(a-9))=0
We calculate terms in parentheses: -(3(a-9)), so:We get rid of parentheses
3(a-9)
We multiply parentheses
3a-27
Back to the equation:
-(3a-27)
3a-3a+27-27=0
We add all the numbers together, and all the variables
=0
a=0/1
a=0
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