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19s-10s-7s-2s+2s=18
We move all terms to the left:
19s-10s-7s-2s+2s-(18)=0
We add all the numbers together, and all the variables
2s-18=0
We move all terms containing s to the left, all other terms to the right
2s=18
s=18/2
s=9
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