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-15=s/5+3
We move all terms to the left:
-15-(s/5+3)=0
We get rid of parentheses
-s/5-3-15=0
We multiply all the terms by the denominator
-s-3*5-15*5=0
We add all the numbers together, and all the variables
-1s-90=0
We move all terms containing s to the left, all other terms to the right
-s=90
s=90/-1
s=-90
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