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-57=-12+3s
We move all terms to the left:
-57-(-12+3s)=0
We add all the numbers together, and all the variables
-(3s-12)-57=0
We get rid of parentheses
-3s+12-57=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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