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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2/11)*x+1/x = 7 // - 7
(2/11)*x+1/x-7 = 0
2/11*x^1+1*x^-1-7*x^0 = 0
(2/11*x^2-7*x^1+1*x^0)/(x^1) = 0 // * x^2
x^1*(2/11*x^2-7*x^1+1*x^0) = 0
x^1
(2/11)*x^2-7*x+1 = 0
(2/11)*x^2-7*x+1 = 0
DELTA = (-7)^2-(1*4*(2/11))
DELTA = 531/11
DELTA > 0
x = ((531/11)^(1/2)+7)/(2*(2/11)) or x = (7-(531/11)^(1/2))/(2*(2/11))
x = 11/4*((531/11)^(1/2)+7) or x = 11/4*(7-(531/11)^(1/2))
x in { 11/4*(7-(531/11)^(1/2)), 11/4*((531/11)^(1/2)+7)}
x in { 11/4*(7-(531/11)^(1/2)), 11/4*((531/11)^(1/2)+7) }
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