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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x-(5/2) = 4/x // - 4/x
1/x-(4/x)-(5/2) = 0
1/x-4*x^-1-5/2 = 0
-3*x^-1 = 5/2 // : -3
x^-1 = -5/6
-1 < 0
1/(x^1) = -5/6 // * x^1
1 = -5/6*x^1 // : -5/6
-6/5 = x^1
x = -6/5
x = -6/5
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