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s/4-15=-13
We move all terms to the left:
s/4-15-(-13)=0
We add all the numbers together, and all the variables
s/4-2=0
We multiply all the terms by the denominator
s-2*4=0
We add all the numbers together, and all the variables
s-8=0
We move all terms containing s to the left, all other terms to the right
s=8
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