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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
e/x = c+3/x // - c+3/x
e/x-c-(3/x) = 0
e/x-c-3*x^-1 = 0
(e-3)*x^-1 = c // : e-3
x^-1 = c/(e-3)
-1 < 0
1/(x^1) = c/(e-3) // * x^1
1 = (c/(e-3))*x^1 // : c/(e-3)
1/(c/(e-3)) = x^1
x = 1/(c/(e-3))
x = 1/(c/(e-3))
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