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13=26-s
We move all terms to the left:
13-(26-s)=0
We add all the numbers together, and all the variables
-(-1s+26)+13=0
We get rid of parentheses
1s-26+13=0
We add all the numbers together, and all the variables
s-13=0
We move all terms containing s to the left, all other terms to the right
s=13
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