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s in (-oo:+oo)
-3/5 = s-3/4 // - s-3/4
-s-3/5-(-3/4) = 0
3/4-s-3/5 = 0
3/20-s = 0 // - 3/20
-s = -3/20 // * -1
s = 3/20
s = 3/20
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