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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x+10/x-5 = 6/3 // - 6/3
x+10/x-(6/3)-5 = 0
x+10/x-5-2 = 0
1*x^1+10*x^-1-7*x^0 = 0
(1*x^2-7*x^1+10*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-7*x^1+10*x^0) = 0
x^1
x^2-7*x+10 = 0
x^2-7*x+10 = 0
DELTA = (-7)^2-(1*4*10)
DELTA = 9
DELTA > 0
x = (9^(1/2)+7)/(1*2) or x = (7-9^(1/2))/(1*2)
x = 5 or x = 2
x in { 2, 5}
x in { 2, 5 }
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