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285=20s-60
We move all terms to the left:
285-(20s-60)=0
We get rid of parentheses
-20s+60+285=0
We add all the numbers together, and all the variables
-20s+345=0
We move all terms containing s to the left, all other terms to the right
-20s=-345
s=-345/-20
s=17+1/4
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