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D( s )
3-(5*s) = 0
3-(5*s) = 0
3-(5*s) = 0
3-5*s = 0
3-5*s = 0 // - 3
-5*s = -3 // : -5
s = -3/(-5)
s = 3/5
s in (-oo:3/5) U (3/5:+oo)
3 = 9/(3-(5*s)) // - 9/(3-(5*s))
3-(9/(3-(5*s))) = 0
3-9*(3-5*s)^-1 = 0
3-9/(3-5*s) = 0
(3*(3-5*s))/(3-5*s)-9/(3-5*s) = 0
3*(3-5*s)-9 = 0
-15*s = 0
(-15*s)/(3-5*s) = 0
(-15*s)/(3-5*s) = 0 // * 3-5*s
-15*s = 0
-15*s = 0 // : -15
s = 0
s = 0
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