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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(22/3)*x-1 = 7/x // - 7/x
(22/3)*x-(7/x)-1 = 0
(22/3)*x-7*x^-1-1 = 0
22/3*x^1-7*x^-1-1*x^0 = 0
(22/3*x^2-1*x^1-7*x^0)/(x^1) = 0 // * x^2
x^1*(22/3*x^2-1*x^1-7*x^0) = 0
x^1
(22/3)*x^2-x-7 = 0
(22/3)*x^2-x-7 = 0
DELTA = (-1)^2-(-7*4*(22/3))
DELTA = 619/3
DELTA > 0
x = ((619/3)^(1/2)+1)/(2*(22/3)) or x = (1-(619/3)^(1/2))/(2*(22/3))
x = 3/44*((619/3)^(1/2)+1) or x = 3/44*(1-(619/3)^(1/2))
x in { 3/44*(1-(619/3)^(1/2)), 3/44*((619/3)^(1/2)+1)}
x in { 3/44*(1-(619/3)^(1/2)), 3/44*((619/3)^(1/2)+1) }
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