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s in (-oo:+oo)
5*s = 9/10 // - 9/10
5*s-(9/10) = 0
5*s-9/10 = 0
5*s-9/10 = 0 // + 9/10
5*s = 9/10 // : 5
s = 9/10/5
s = 9/50
s = 9/50
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