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30=5(s-4)
We move all terms to the left:
30-(5(s-4))=0
We calculate terms in parentheses: -(5(s-4)), so:We get rid of parentheses
5(s-4)
We multiply parentheses
5s-20
Back to the equation:
-(5s-20)
-5s+20+30=0
We add all the numbers together, and all the variables
-5s+50=0
We move all terms containing s to the left, all other terms to the right
-5s=-50
s=-50/-5
s=+10
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