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9-s/2=4
We move all terms to the left:
9-s/2-(4)=0
We add all the numbers together, and all the variables
-s/2+5=0
We multiply all the terms by the denominator
-s+5*2=0
We add all the numbers together, and all the variables
-1s+10=0
We move all terms containing s to the left, all other terms to the right
-s=-10
s=-10/-1
s=+10
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