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27=9.s
We move all terms to the left:
27-(9.s)=0
We add all the numbers together, and all the variables
-(+9.s)+27=0
We get rid of parentheses
-9.s+27=0
We add all the numbers together, and all the variables
-9s+27=0
We move all terms containing s to the left, all other terms to the right
-9s=-27
s=-27/-9
s=+3
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