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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
30/x = 0.11*x // - 0.11*x
30/x-(0.11*x) = 0
30/x-0.11*x = 0
30*x^-1-0.11*x = 0
x^-1*(30-0.11*x^2) = 0
-0.11*x^2 = -30 // : -0.11
x^2 = 272.72727273
x^2 = 272.72727273 // ^ 1/2
abs(x) = 272.72727273^(1/2)
x = 272.72727273^(1/2) or x = -272.72727273^(1/2)
1/x = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x należy do O
x in { 272.72727273^(1/2), -272.72727273^(1/2) }
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