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9s/2+20=74
We move all terms to the left:
9s/2+20-(74)=0
We add all the numbers together, and all the variables
9s/2-54=0
We multiply all the terms by the denominator
9s-54*2=0
We add all the numbers together, and all the variables
9s-108=0
We move all terms containing s to the left, all other terms to the right
9s=108
s=108/9
s=12
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