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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
x/(x^2)-(6*x) = 1 // - 1
x/(x^2)-(6*x)-1 = 0
x/(x^2)-6*x-1 = 0
1*x^-1-6*x^1-1*x^0 = 0
(1*x^0-6*x^2-1*x^1)/(x^1) = 0 // * x^2
x^1*(1*x^0-6*x^2-1*x^1) = 0
x^1
1-6*x^2-x = 0
1-6*x^2-x = 0
DELTA = (-1)^2-(-6*1*4)
DELTA = 25
DELTA > 0
x = (25^(1/2)+1)/(-6*2) or x = (1-25^(1/2))/(-6*2)
x = -1/2 or x = 1/3
x in { -1/2, 1/3}
x in { -1/2, 1/3 }
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