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s/7-1=3
We move all terms to the left:
s/7-1-(3)=0
We add all the numbers together, and all the variables
s/7-4=0
We multiply all the terms by the denominator
s-4*7=0
We add all the numbers together, and all the variables
s-28=0
We move all terms containing s to the left, all other terms to the right
s=28
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