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-4s-5s=8-9
We move all terms to the left:
-4s-5s-(8-9)=0
We add all the numbers together, and all the variables
-4s-5s-(-1)=0
We add all the numbers together, and all the variables
-9s+1=0
We move all terms containing s to the left, all other terms to the right
-9s=-1
s=-1/-9
s=1/9
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