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9n-1+11n=7(11+n)
We move all terms to the left:
9n-1+11n-(7(11+n))=0
We add all the numbers together, and all the variables
9n+11n-(7(n+11))-1=0
We add all the numbers together, and all the variables
20n-(7(n+11))-1=0
We calculate terms in parentheses: -(7(n+11)), so:We get rid of parentheses
7(n+11)
We multiply parentheses
7n+77
Back to the equation:
-(7n+77)
20n-7n-77-1=0
We add all the numbers together, and all the variables
13n-78=0
We move all terms containing n to the left, all other terms to the right
13n=78
n=78/13
n=6
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