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99=9(n+1)
We move all terms to the left:
99-(9(n+1))=0
We calculate terms in parentheses: -(9(n+1)), so:We get rid of parentheses
9(n+1)
We multiply parentheses
9n+9
Back to the equation:
-(9n+9)
-9n-9+99=0
We add all the numbers together, and all the variables
-9n+90=0
We move all terms containing n to the left, all other terms to the right
-9n=-90
n=-90/-9
n=+10
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