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s=4s-45
We move all terms to the left:
s-(4s-45)=0
We get rid of parentheses
s-4s+45=0
We add all the numbers together, and all the variables
-3s+45=0
We move all terms containing s to the left, all other terms to the right
-3s=-45
s=-45/-3
s=+15
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