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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
36/x-5 = (17/2)*x // - (17/2)*x
36/x-((17/2)*x)-5 = 0
(-17/2)*x+36/x-5 = 0
36*x^-1-17/2*x^1-5*x^0 = 0
(36*x^0-17/2*x^2-5*x^1)/(x^1) = 0 // * x^2
x^1*(36*x^0-17/2*x^2-5*x^1) = 0
x^1
(-17/2)*x^2-5*x+36 = 0
(-17/2)*x^2-5*x+36 = 0
DELTA = (-5)^2-(4*36*(-17/2))
DELTA = 1249
DELTA > 0
x = (1249^(1/2)+5)/(2*(-17/2)) or x = (5-1249^(1/2))/(2*(-17/2))
x = (1249^(1/2)+5)/(-17) or x = (5-1249^(1/2))/(-17)
x in { (1249^(1/2)+5)/(-17), (5-1249^(1/2))/(-17)}
x in { (1249^(1/2)+5)/(-17), (5-1249^(1/2))/(-17) }
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