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-13s+(-12)s-(-17)s+(-s)=9
We move all terms to the left:
-13s+(-12)s-(-17)s+(-s)-(9)=0
We add all the numbers together, and all the variables
-13s+(-12)s-(-17)s+(-1s)-9=0
We multiply parentheses
-13s-12s+17s+(-1s)-9=0
We get rid of parentheses
-13s-12s+17s-1s-9=0
We add all the numbers together, and all the variables
-9s-9=0
We move all terms containing s to the left, all other terms to the right
-9s=9
s=9/-9
s=-1
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