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13s=2s-7
We move all terms to the left:
13s-(2s-7)=0
We get rid of parentheses
13s-2s+7=0
We add all the numbers together, and all the variables
11s+7=0
We move all terms containing s to the left, all other terms to the right
11s=-7
s=-7/11
s=-7/11
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