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57=2(1+5n)-5(1+6n)
We move all terms to the left:
57-(2(1+5n)-5(1+6n))=0
We add all the numbers together, and all the variables
-(2(5n+1)-5(6n+1))+57=0
We calculate terms in parentheses: -(2(5n+1)-5(6n+1)), so:We get rid of parentheses
2(5n+1)-5(6n+1)
We multiply parentheses
10n-30n+2-5
We add all the numbers together, and all the variables
-20n-3
Back to the equation:
-(-20n-3)
20n+3+57=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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