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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x+1/x+4 = 1/3 // - 1/3
1/x+1/x-(1/3)+4 = 0
1/x+1/x-1/3+4 = 0
2*x^-1 = -11/3 // : 2
x^-1 = -11/6
-1 < 0
1/(x^1) = -11/6 // * x^1
1 = -11/6*x^1 // : -11/6
-6/11 = x^1
x = -6/11
x = -6/11
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