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(-13s)-(-15)=-11
We move all terms to the left:
(-13s)-(-15)-(-11)=0
We add all the numbers together, and all the variables
(-13s)+26=0
We get rid of parentheses
-13s+26=0
We move all terms containing s to the left, all other terms to the right
-13s=-26
s=-26/-13
s=+2
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