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-309=-30s+-9
We move all terms to the left:
-309-(-30s+-9)=0
We add all the numbers together, and all the variables
-(-30s-9)-309=0
We get rid of parentheses
30s+9-309=0
We add all the numbers together, and all the variables
30s-300=0
We move all terms containing s to the left, all other terms to the right
30s=300
s=300/30
s=10
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