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42=36+s/9
We move all terms to the left:
42-(36+s/9)=0
We add all the numbers together, and all the variables
-(s/9+36)+42=0
We get rid of parentheses
-s/9-36+42=0
We multiply all the terms by the denominator
-s-36*9+42*9=0
We add all the numbers together, and all the variables
-1s+54=0
We move all terms containing s to the left, all other terms to the right
-s=-54
s=-54/-1
s=+54
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