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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/4 = 0.1/x // - 0.1/x
1/4-(0.1/x) = 0
1/4-0.1*x^-1 = 0
-0.1*x^-1 = -1/4 // : -0.1
x^-1 = 2.5
-1 < 0
1/(x^1) = 2.5 // * x^1
1 = 2.5*x^1 // : 2.5
0.4 = x^1
x = 0.4
x = 0.4
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