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63=3(9-2n)
We move all terms to the left:
63-(3(9-2n))=0
We add all the numbers together, and all the variables
-(3(-2n+9))+63=0
We calculate terms in parentheses: -(3(-2n+9)), so:We get rid of parentheses
3(-2n+9)
We multiply parentheses
-6n+27
Back to the equation:
-(-6n+27)
6n-27+63=0
We add all the numbers together, and all the variables
6n+36=0
We move all terms containing n to the left, all other terms to the right
6n=-36
n=-36/6
n=-6
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