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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
Q = v/x // - v/x
Q-(v/x) = 0
-v*x^-1 = -Q // : -v
x^-1 = Q/v
-1 < 0
1/(x^1) = Q/v // * x^1
1 = (Q/v)*x^1 // : Q/v
1/(Q/v) = x^1
x = 1/(Q/v)
x = 1/(Q/v)
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