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