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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2*x-(36/x) = 6 // - 6
2*x-(36/x)-6 = 0
2*x-36*x^-1-6 = 0
2*x^1-36*x^-1-6*x^0 = 0
(2*x^2-6*x^1-36*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^2-6*x^1-36*x^0) = 0
x^1
2*x^2-6*x-36 = 0
2*x^2-6*x-36 = 0
DELTA = (-6)^2-(-36*2*4)
DELTA = 324
DELTA > 0
x = (324^(1/2)+6)/(2*2) or x = (6-324^(1/2))/(2*2)
x = 6 or x = -3
x in { -3, 6}
x in { -3, 6 }
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