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-18=-2s+6s
We move all terms to the left:
-18-(-2s+6s)=0
We add all the numbers together, and all the variables
-(+4s)-18=0
We get rid of parentheses
-4s-18=0
We move all terms containing s to the left, all other terms to the right
-4s=18
s=18/-4
s=-4+1/2
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