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s/1=-3
We move all terms to the left:
s/1-(-3)=0
We add all the numbers together, and all the variables
s/1+3=0
We multiply all the terms by the denominator
s+3*1=0
We add all the numbers together, and all the variables
s+3=0
We move all terms containing s to the left, all other terms to the right
s=-3
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