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-48=s+3s
We move all terms to the left:
-48-(s+3s)=0
We add all the numbers together, and all the variables
-(+4s)-48=0
We get rid of parentheses
-4s-48=0
We move all terms containing s to the left, all other terms to the right
-4s=48
s=48/-4
s=-12
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