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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
5*y^2-((15*y)/y)-3 = 0
5*y^2-15-3 = 0
5*y^2 = 18 // : 5
y^2 = 18/5
y^2 = 18/5 // ^ 1/2
abs(y) = (18/5)^(1/2)
y = (18/5)^(1/2) or y = -(18/5)^(1/2)
y in { (18/5)^(1/2), -(18/5)^(1/2) }
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