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s/3+13=26
We move all terms to the left:
s/3+13-(26)=0
We add all the numbers together, and all the variables
s/3-13=0
We multiply all the terms by the denominator
s-13*3=0
We add all the numbers together, and all the variables
s-39=0
We move all terms containing s to the left, all other terms to the right
s=39
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