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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x = 0.75/6 // - 0.75/6
1/x-(0.75/6) = 0
1/x-0.125 = 0
1*x^-1 = 0.125 // : 1
x^-1 = 0.125
-1 < 0
1/(x^1) = 0.125 // * x^1
1 = 0.125*x^1 // : 0.125
8 = x^1
x = 8
x = 8
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