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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4*c = 7/x // - 7/x
4*c-(7/x) = 0
4*c-7*x^-1 = 0
-7*x^-1 = -(4*c) // : -7
x^-1 = (-4*c)/(-7)
-1 < 0
1/(x^1) = (-4*c)/(-7) // * x^1
1 = ((-4*c)/(-7))*x^1 // : (-4*c)/(-7)
(7*c^-1)/4 = x^1
x = (7*c^-1)/4
x = (7*c^-1)/4
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