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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/x = 3.4 // - 3.4
8/x-3.4 = 0
8*x^-1 = 3.4 // : 8
x^-1 = 0.425
-1 < 0
1/(x^1) = 0.425 // * x^1
1 = 0.425*x^1 // : 0.425
2.35294118 = x^1
x = 2.35294118
x = 2.35294118
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