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420s=1/4
We move all terms to the left:
420s-(1/4)=0
We add all the numbers together, and all the variables
420s-(+1/4)=0
We get rid of parentheses
420s-1/4=0
We multiply all the terms by the denominator
420s*4-1=0
Wy multiply elements
1680s-1=0
We move all terms containing s to the left, all other terms to the right
1680s=1
s=1/1680
s=1/1680
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