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s/11+395=420
We move all terms to the left:
s/11+395-(420)=0
We add all the numbers together, and all the variables
s/11-25=0
We multiply all the terms by the denominator
s-25*11=0
We add all the numbers together, and all the variables
s-275=0
We move all terms containing s to the left, all other terms to the right
s=275
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