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20=s/7-1
We move all terms to the left:
20-(s/7-1)=0
We get rid of parentheses
-s/7+1+20=0
We multiply all the terms by the denominator
-s+1*7+20*7=0
We add all the numbers together, and all the variables
-1s+147=0
We move all terms containing s to the left, all other terms to the right
-s=-147
s=-147/-1
s=+147
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