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s in (-oo:+oo)
9/25 = s/300 // - s/300
9/25-(s/300) = 0
9/25-1/300*s = 0 // - 9/25
-1/300*s = -9/25 // : -1/300
s = -9/25/(-1/300)
s = 108
s = 108
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