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77=7(n+1)
We move all terms to the left:
77-(7(n+1))=0
We calculate terms in parentheses: -(7(n+1)), so:We get rid of parentheses
7(n+1)
We multiply parentheses
7n+7
Back to the equation:
-(7n+7)
-7n-7+77=0
We add all the numbers together, and all the variables
-7n+70=0
We move all terms containing n to the left, all other terms to the right
-7n=-70
n=-70/-7
n=+10
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