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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(5/3)*x+1/x = 7/3+13 // - 7/3+13
(5/3)*x+1/x-(7/3)-13 = 0
(5/3)*x+1/x-7/3-13 = 0
5/3*x^1+1*x^-1-46/3*x^0 = 0
(5/3*x^2-46/3*x^1+1*x^0)/(x^1) = 0 // * x^2
x^1*(5/3*x^2-46/3*x^1+1*x^0) = 0
x^1
(5/3)*x^2+(-46/3)*x+1 = 0
(5/3)*x^2+(-46/3)*x+1 = 0
DELTA = (-46/3)^2-(1*4*(5/3))
DELTA = 2056/9
DELTA > 0
x = ((2056/9)^(1/2)-(-46/3))/(2*(5/3)) or x = (-(-46/3)-(2056/9)^(1/2))/(2*(5/3))
x = 3/10*((2056/9)^(1/2)+46/3) or x = 3/10*(46/3-(2056/9)^(1/2))
x in { 3/10*(46/3-(2056/9)^(1/2)), 3/10*((2056/9)^(1/2)+46/3)}
x in { 3/10*(46/3-(2056/9)^(1/2)), 3/10*((2056/9)^(1/2)+46/3) }
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