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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8.5/x = 3.5 // - 3.5
8.5/x-3.5 = 0
8.5*x^-1 = 3.5 // : 8.5
x^-1 = 0.41176471
-1 < 0
1/(x^1) = 0.41176471 // * x^1
1 = 0.41176471*x^1 // : 0.41176471
2.4285714 = x^1
x = 2.4285714
x = 2.4285714
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