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4=s/7-2
We move all terms to the left:
4-(s/7-2)=0
We get rid of parentheses
-s/7+2+4=0
We multiply all the terms by the denominator
-s+2*7+4*7=0
We add all the numbers together, and all the variables
-1s+42=0
We move all terms containing s to the left, all other terms to the right
-s=-42
s=-42/-1
s=+42
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