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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/9.4 = 0.5/x // - 0.5/x
2/9.4-(0.5/x) = 0
2/9.4-0.5*x^-1 = 0
-0.5*x^-1 = -0.21276596 // : -0.5
x^-1 = 0.42553192
-1 < 0
1/(x^1) = 0.42553192 // * x^1
1 = 0.42553192*x^1 // : 0.42553192
2.34999997 = x^1
x = 2.34999997
x = 2.34999997
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