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9s/2=90/9
We move all terms to the left:
9s/2-(90/9)=0
We add all the numbers together, and all the variables
9s/2-10=0
We multiply all the terms by the denominator
9s-10*2=0
We add all the numbers together, and all the variables
9s-20=0
We move all terms containing s to the left, all other terms to the right
9s=20
s=20/9
s=2+2/9
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