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13=s/3+10
We move all terms to the left:
13-(s/3+10)=0
We get rid of parentheses
-s/3-10+13=0
We multiply all the terms by the denominator
-s-10*3+13*3=0
We add all the numbers together, and all the variables
-1s+9=0
We move all terms containing s to the left, all other terms to the right
-s=-9
s=-9/-1
s=+9
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