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s/2+12=13
We move all terms to the left:
s/2+12-(13)=0
We add all the numbers together, and all the variables
s/2-1=0
We multiply all the terms by the denominator
s-1*2=0
We add all the numbers together, and all the variables
s-2=0
We move all terms containing s to the left, all other terms to the right
s=2
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