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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x = 5/2+3 // - 5/2+3
4/x-(5/2)-3 = 0
4/x-5/2-3 = 0
4*x^-1 = 11/2 // : 4
x^-1 = 11/8
-1 < 0
1/(x^1) = 11/8 // * x^1
1 = 11/8*x^1 // : 11/8
8/11 = x^1
x = 8/11
x = 8/11
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