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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = x+13/6 // - x+13/6
5/x-x-(13/6) = 0
5/x-x-13/6 = 0
5*x^-1-1*x^1-13/6*x^0 = 0
(5*x^0-1*x^2-13/6*x^1)/(x^1) = 0 // * x^2
x^1*(5*x^0-1*x^2-13/6*x^1) = 0
x^1
(-13/6)*x-x^2+5 = 0
(-13/6)*x-x^2+5 = 0
DELTA = (-13/6)^2-(-1*4*5)
DELTA = 889/36
DELTA > 0
x = ((889/36)^(1/2)-(-13/6))/(-1*2) or x = (-(-13/6)-(889/36)^(1/2))/(-1*2)
x = ((889/36)^(1/2)+13/6)/(-2) or x = (13/6-(889/36)^(1/2))/(-2)
x in { ((889/36)^(1/2)+13/6)/(-2), (13/6-(889/36)^(1/2))/(-2)}
x in { ((889/36)^(1/2)+13/6)/(-2), (13/6-(889/36)^(1/2))/(-2) }
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