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-15s-(-18s)=6
We move all terms to the left:
-15s-(-18s)-(6)=0
We get rid of parentheses
-15s+18s-6=0
We add all the numbers together, and all the variables
3s-6=0
We move all terms containing s to the left, all other terms to the right
3s=6
s=6/3
s=2
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