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-3(2s+9)+13s=-20s
We move all terms to the left:
-3(2s+9)+13s-(-20s)=0
We add all the numbers together, and all the variables
13s-3(2s+9)-(-20s)=0
We multiply parentheses
13s-6s-(-20s)-27=0
We get rid of parentheses
13s-6s+20s-27=0
We add all the numbers together, and all the variables
27s-27=0
We move all terms containing s to the left, all other terms to the right
27s=27
s=27/27
s=1
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