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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(3/7)*x-(2/x) = 11 // - 11
(3/7)*x-(2/x)-11 = 0
(3/7)*x-2*x^-1-11 = 0
3/7*x^1-2*x^-1-11*x^0 = 0
(3/7*x^2-11*x^1-2*x^0)/(x^1) = 0 // * x^2
x^1*(3/7*x^2-11*x^1-2*x^0) = 0
x^1
(3/7)*x^2-11*x-2 = 0
(3/7)*x^2-11*x-2 = 0
DELTA = (-11)^2-(-2*4*(3/7))
DELTA = 871/7
DELTA > 0
x = ((871/7)^(1/2)+11)/(2*(3/7)) or x = (11-(871/7)^(1/2))/(2*(3/7))
x = 7/6*((871/7)^(1/2)+11) or x = 7/6*(11-(871/7)^(1/2))
x in { 7/6*(11-(871/7)^(1/2)), 7/6*((871/7)^(1/2)+11)}
x in { 7/6*(11-(871/7)^(1/2)), 7/6*((871/7)^(1/2)+11) }
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