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D( x )
(-5)^2-4*x-5 = 0
(-5)^2-4*x-5 = 0
(-5)^2-4*x-5 = 0
20-4*x = 0 // - 20
-4*x = -20 // : -4
x = -20/(-4)
x = 5
x in (-oo:5) U (5:+oo)
(3^3-10-7)/((-5)^2-4*x-5) = 0
10/(20-4*x) = 0
x belongs to the empty set
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