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-10(s+3)=-31
We move all terms to the left:
-10(s+3)-(-31)=0
We add all the numbers together, and all the variables
-10(s+3)+31=0
We multiply parentheses
-10s-30+31=0
We add all the numbers together, and all the variables
-10s+1=0
We move all terms containing s to the left, all other terms to the right
-10s=-1
s=-1/-10
s=1/10
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