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