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D( x )
x = 0
x^2 = 0
x = 0
x = 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^2)/x-(((3/3)*x)/(x^2))-27+6 = 0
(x^2)/x-x^-1-27+6 = 0
1*x^1-1*x^-1-21*x^0 = 0
(1*x^2-21*x^1-1*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-21*x^1-1*x^0) = 0
x^1
x^2-21*x-1 = 0
x^2-21*x-1 = 0
DELTA = (-21)^2-(-1*1*4)
DELTA = 445
DELTA > 0
x = (445^(1/2)+21)/(1*2) or x = (21-445^(1/2))/(1*2)
x = (445^(1/2)+21)/2 or x = (21-445^(1/2))/2
x in { (21-445^(1/2))/2, (445^(1/2)+21)/2}
x in { (21-445^(1/2))/2, (445^(1/2)+21)/2 }
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