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D( X )
X-3 = 0
X-3 = 0
X-3 = 0
X-3 = 0 // + 3
X = 3
X in (-oo:3) U (3:+oo)
2*X-(1/(X-3)) = 0
2*X-(X-3)^-1 = 0
2*X-1/(X-3) = 0
(2*X*(X-3))/(X-3)-1/(X-3) = 0
2*X*(X-3)-1 = 0
2*X^2-6*X-1 = 0
2*X^2-6*X-1 = 0
2*X^2-6*X-1 = 0
DELTA = (-6)^2-(-1*2*4)
DELTA = 44
DELTA > 0
X = (44^(1/2)+6)/(2*2) or X = (6-44^(1/2))/(2*2)
X = (2*11^(1/2)+6)/4 or X = (6-2*11^(1/2))/4
(X-((6-2*11^(1/2))/4))*(X-((2*11^(1/2)+6)/4)) = 0
((X-((6-2*11^(1/2))/4))*(X-((2*11^(1/2)+6)/4)))/(X-3) = 0
((X-((6-2*11^(1/2))/4))*(X-((2*11^(1/2)+6)/4)))/(X-3) = 0 // * X-3
(X-((6-2*11^(1/2))/4))*(X-((2*11^(1/2)+6)/4)) = 0
( X-((2*11^(1/2)+6)/4) )
X-((2*11^(1/2)+6)/4) = 0 // + (2*11^(1/2)+6)/4
X = (2*11^(1/2)+6)/4
( X-((6-2*11^(1/2))/4) )
X-((6-2*11^(1/2))/4) = 0 // + (6-2*11^(1/2))/4
X = (6-2*11^(1/2))/4
X in { (2*11^(1/2)+6)/4, (6-2*11^(1/2))/4 }
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