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