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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.3*x = 18/x // - 18/x
0.3*x-(18/x) = 0
0.3*x-18*x^-1 = 0
0.3*x-18*x^-1 = 0
x^-1*(0.3*x^2-18) = 0
0.3*x^2 = 18 // : 0.3
x^2 = 60
x^2 = 60 // ^ 1/2
abs(x) = 2*15^(1/2)
x = 2*15^(1/2) or x = -(2*15^(1/2))
1/x = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x należy do O
x in { 2*15^(1/2), -(2*15^(1/2)) }
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