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9=s/2+7
We move all terms to the left:
9-(s/2+7)=0
We get rid of parentheses
-s/2-7+9=0
We multiply all the terms by the denominator
-s-7*2+9*2=0
We add all the numbers together, and all the variables
-1s+4=0
We move all terms containing s to the left, all other terms to the right
-s=-4
s=-4/-1
s=+4
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