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99=9(s+9)
We move all terms to the left:
99-(9(s+9))=0
We calculate terms in parentheses: -(9(s+9)), so:We get rid of parentheses
9(s+9)
We multiply parentheses
9s+81
Back to the equation:
-(9s+81)
-9s-81+99=0
We add all the numbers together, and all the variables
-9s+18=0
We move all terms containing s to the left, all other terms to the right
-9s=-18
s=-18/-9
s=+2
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