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s-91/(-7)=-1
We move all terms to the left:
s-91/(-7)-(-1)=0
We add all the numbers together, and all the variables
s+1-91/(-7)=0
We multiply all the terms by the denominator
s*(-7)-91+1*(-7)=0
We add all the numbers together, and all the variables
s*(-7)-98=0
We multiply parentheses
-7s-98=0
We move all terms containing s to the left, all other terms to the right
-7s=98
s=98/-7
s=-14
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