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15=s/4+13
We move all terms to the left:
15-(s/4+13)=0
We get rid of parentheses
-s/4-13+15=0
We multiply all the terms by the denominator
-s-13*4+15*4=0
We add all the numbers together, and all the variables
-1s+8=0
We move all terms containing s to the left, all other terms to the right
-s=-8
s=-8/-1
s=+8
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