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2s+9=10s-55
We move all terms to the left:
2s+9-(10s-55)=0
We get rid of parentheses
2s-10s+55+9=0
We add all the numbers together, and all the variables
-8s+64=0
We move all terms containing s to the left, all other terms to the right
-8s=-64
s=-64/-8
s=+8
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