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-1+s=-s-18+3s
We move all terms to the left:
-1+s-(-s-18+3s)=0
We add all the numbers together, and all the variables
s-(2s-18)-1=0
We get rid of parentheses
s-2s+18-1=0
We add all the numbers together, and all the variables
-1s+17=0
We move all terms containing s to the left, all other terms to the right
-s=-17
s=-17/-1
s=+17
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