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