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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
0.7/X-(3.5*X) = 0
0.7/X-3.5*X = 0
0.7*X^-1-3.5*X = 0
X^-1*(0.7-3.5*X^2) = 0
-3.5*X^2 = -0.7 // : -3.5
X^2 = 0.2
X^2 = 0.2 // ^ 1/2
abs(X) = 0.2^(1/2)
X = 0.2^(1/2) or X = -0.2^(1/2)
1/X = 0
1*X^-1 = 0 // : 1
X^-1 = 0
X należy do O
X in { 0.2^(1/2), -0.2^(1/2) }
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