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s/20+18=19
We move all terms to the left:
s/20+18-(19)=0
We add all the numbers together, and all the variables
s/20-1=0
We multiply all the terms by the denominator
s-1*20=0
We add all the numbers together, and all the variables
s-20=0
We move all terms containing s to the left, all other terms to the right
s=20
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