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20=s/2+13
We move all terms to the left:
20-(s/2+13)=0
We get rid of parentheses
-s/2-13+20=0
We multiply all the terms by the denominator
-s-13*2+20*2=0
We add all the numbers together, and all the variables
-1s+14=0
We move all terms containing s to the left, all other terms to the right
-s=-14
s=-14/-1
s=+14
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