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D( x )
-x = 0
-x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/(-x) < (-1/3)*x // - (-1/3)*x
5/(-x)-((-1/3)*x) < 0
(1/3)*x+5/(-x) < 0
1/3*x-5*x^-1 = 0
x^-1*(1/3*x^2-5) = 0
1/3*x^2 = 5 // : 1/3
x^2 = 15
x^2 = 15 // ^ 1/2
abs(x) = 15^(1/2)
x = 15^(1/2) or x = -15^(1/2)
1/x = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x należy do O
(x-15^(1/2))*(x+15^(1/2)) < 0
(-oo:-15^(1/2)) (-15^(1/2):15^(1/2)) (15^(1/2):+oo) x-15^(1/2) - - + x+15^(1/2) - + +
x in (-15^(1/2):0) U (0:15^(1/2))
(-15^(1/2):0) U (0:15^(1/2))
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