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6=3(a-3)
We move all terms to the left:
6-(3(a-3))=0
We calculate terms in parentheses: -(3(a-3)), so:We get rid of parentheses
3(a-3)
We multiply parentheses
3a-9
Back to the equation:
-(3a-9)
-3a+9+6=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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