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55=2s+15
We move all terms to the left:
55-(2s+15)=0
We get rid of parentheses
-2s-15+55=0
We add all the numbers together, and all the variables
-2s+40=0
We move all terms containing s to the left, all other terms to the right
-2s=-40
s=-40/-2
s=+20
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