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-36=-5s-4s
We move all terms to the left:
-36-(-5s-4s)=0
We add all the numbers together, and all the variables
-(-9s)-36=0
We get rid of parentheses
9s-36=0
We move all terms containing s to the left, all other terms to the right
9s=36
s=36/9
s=4
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