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9=4s+13
We move all terms to the left:
9-(4s+13)=0
We get rid of parentheses
-4s-13+9=0
We add all the numbers together, and all the variables
-4s-4=0
We move all terms containing s to the left, all other terms to the right
-4s=4
s=4/-4
s=-1
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