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