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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/8.5 = 1/x // - 1/x
6/8.5-(1/x) = 0
6/8.5-x^-1 = 0
-1*x^-1 = -0.70588235 // : -1
x^-1 = 0.70588235
-1 < 0
1/(x^1) = 0.70588235 // * x^1
1 = 0.70588235*x^1 // : 0.70588235
1.41666667 = x^1
x = 1.41666667
x = 1.41666667
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