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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.5*x = 12/x // - 12/x
1.5*x-(12/x) = 0
1.5*x-12*x^-1 = 0
1.5*x-12*x^-1 = 0
x^-1*(1.5*x^2-12) = 0
1.5*x^2 = 12 // : 1.5
x^2 = 8
x^2 = 8 // ^ 1/2
abs(x) = 2*2^(1/2)
x = 2*2^(1/2) or x = -(2*2^(1/2))
1/x = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x należy do O
x in { 2*2^(1/2), -(2*2^(1/2)) }
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