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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(14/x)-(x/x)+1+1 = 0
x-14*x^-1-1+1+1 = 0
1*x^1-14*x^-1+1*x^0 = 0
(1*x^2+1*x^1-14*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2+1*x^1-14*x^0) = 0
x^1
x^2+x-14 = 0
x^2+x-14 = 0
DELTA = 1^2-(-14*1*4)
DELTA = 57
DELTA > 0
x = (57^(1/2)-1)/(1*2) or x = (-57^(1/2)-1)/(1*2)
x = (57^(1/2)-1)/2 or x = (-(57^(1/2)+1))/2
x in { (-(57^(1/2)+1))/2, (57^(1/2)-1)/2}
x in { (-(57^(1/2)+1))/2, (57^(1/2)-1)/2 }
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