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9s+1=4s-9
We move all terms to the left:
9s+1-(4s-9)=0
We get rid of parentheses
9s-4s+9+1=0
We add all the numbers together, and all the variables
5s+10=0
We move all terms containing s to the left, all other terms to the right
5s=-10
s=-10/5
s=-2
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