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90=9(s+6)
We move all terms to the left:
90-(9(s+6))=0
We calculate terms in parentheses: -(9(s+6)), so:We get rid of parentheses
9(s+6)
We multiply parentheses
9s+54
Back to the equation:
-(9s+54)
-9s-54+90=0
We add all the numbers together, and all the variables
-9s+36=0
We move all terms containing s to the left, all other terms to the right
-9s=-36
s=-36/-9
s=+4
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