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-30=s/9
We move all terms to the left:
-30-(s/9)=0
We add all the numbers together, and all the variables
-(+s/9)-30=0
We get rid of parentheses
-s/9-30=0
We multiply all the terms by the denominator
-s-30*9=0
We add all the numbers together, and all the variables
-1s-270=0
We move all terms containing s to the left, all other terms to the right
-s=270
s=270/-1
s=-270
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