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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x+x-(1/x)-(3/x)-4-2 = 10/3 // - 10/3
x+x-(1/x)-(3/x)-(10/3)-4-2 = 0
x+x-x^-1-3*x^-1-10/3-4-2 = 0
2*x^1-4*x^-1-28/3*x^0 = 0
(2*x^2-28/3*x^1-4*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^2-28/3*x^1-4*x^0) = 0
x^1
2*x^2+(-28/3)*x-4 = 0
2*x^2+(-28/3)*x-4 = 0
DELTA = (-28/3)^2-(-4*2*4)
DELTA = 1072/9
DELTA > 0
x = ((1072/9)^(1/2)-(-28/3))/(2*2) or x = (-(-28/3)-(1072/9)^(1/2))/(2*2)
x = ((1072/9)^(1/2)+28/3)/4 or x = (28/3-(1072/9)^(1/2))/4
x in { (28/3-(1072/9)^(1/2))/4, ((1072/9)^(1/2)+28/3)/4}
x in { (28/3-(1072/9)^(1/2))/4, ((1072/9)^(1/2)+28/3)/4 }
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