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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.15 = 8/x // - 8/x
0.15-(8/x) = 0
0.15-8*x^-1 = 0
-8*x^-1 = -0.15 // : -8
x^-1 = 0.01875
-1 < 0
1/(x^1) = 0.01875 // * x^1
1 = 0.01875*x^1 // : 0.01875
53.33333333 = x^1
x = 53.33333333
x = 53.33333333
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