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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x+52/x = 17 // - 17
x+52/x-17 = 0
1*x^1+52*x^-1-17*x^0 = 0
(1*x^2-17*x^1+52*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-17*x^1+52*x^0) = 0
x^1
x^2-17*x+52 = 0
x^2-17*x+52 = 0
DELTA = (-17)^2-(1*4*52)
DELTA = 81
DELTA > 0
x = (81^(1/2)+17)/(1*2) or x = (17-81^(1/2))/(1*2)
x = 13 or x = 4
x in { 4, 13}
x in { 4, 13 }
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