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-s-10s+9s+5s+3s=18
We move all terms to the left:
-s-10s+9s+5s+3s-(18)=0
We add all the numbers together, and all the variables
6s-18=0
We move all terms containing s to the left, all other terms to the right
6s=18
s=18/6
s=3
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