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75=3(6n-3)
We move all terms to the left:
75-(3(6n-3))=0
We calculate terms in parentheses: -(3(6n-3)), so:We get rid of parentheses
3(6n-3)
We multiply parentheses
18n-9
Back to the equation:
-(18n-9)
-18n+9+75=0
We add all the numbers together, and all the variables
-18n+84=0
We move all terms containing n to the left, all other terms to the right
-18n=-84
n=-84/-18
n=4+2/3
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