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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X-(2/5) = 3/x // - 3/x
X-(3/x)-(2/5) = 0
X-3*x^-1-2/5 = 0
-3*x^-1 = -(X-2/5) // : -3
x^-1 = (2/5-X)/(-3)
-1 < 0
1/(x^1) = (2/5-X)/(-3) // * x^1
1 = x^1*((2/5-X)/(-3)) // : (2/5-X)/(-3)
-3*(2/5-X)^-1 = x^1
x = -3*(2/5-X)^-1
x = -3*(2/5-X)^-1
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