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85=5(5+4n)
We move all terms to the left:
85-(5(5+4n))=0
We add all the numbers together, and all the variables
-(5(4n+5))+85=0
We calculate terms in parentheses: -(5(4n+5)), so:We get rid of parentheses
5(4n+5)
We multiply parentheses
20n+25
Back to the equation:
-(20n+25)
-20n-25+85=0
We add all the numbers together, and all the variables
-20n+60=0
We move all terms containing n to the left, all other terms to the right
-20n=-60
n=-60/-20
n=+3
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