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30=s/4-25
We move all terms to the left:
30-(s/4-25)=0
We get rid of parentheses
-s/4+25+30=0
We multiply all the terms by the denominator
-s+25*4+30*4=0
We add all the numbers together, and all the variables
-1s+220=0
We move all terms containing s to the left, all other terms to the right
-s=-220
s=-220/-1
s=+220
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