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100=9s+1
We move all terms to the left:
100-(9s+1)=0
We get rid of parentheses
-9s-1+100=0
We add all the numbers together, and all the variables
-9s+99=0
We move all terms containing s to the left, all other terms to the right
-9s=-99
s=-99/-9
s=+11
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