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18s=19s-13
We move all terms to the left:
18s-(19s-13)=0
We get rid of parentheses
18s-19s+13=0
We add all the numbers together, and all the variables
-1s+13=0
We move all terms containing s to the left, all other terms to the right
-s=-13
s=-13/-1
s=+13
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