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D( x )
3*x-2 = 0
3*x-2 = 0
3*x-2 = 0
3*x-2 = 0 // + 2
3*x = 2 // : 3
x = 2/3
x in (-oo:2/3) U (2/3:+oo)
(15*x^2-x-1)/(3*x-2) = 0
15*x^2-x-1 = 0
15*x^2-x-1 = 0
DELTA = (-1)^2-(-1*4*15)
DELTA = 61
DELTA > 0
x = (61^(1/2)+1)/(2*15) or x = (1-61^(1/2))/(2*15)
x = (61^(1/2)+1)/30 or x = (1-61^(1/2))/30
(x-((1-61^(1/2))/30))*(x-((61^(1/2)+1)/30)) = 0
((x-((1-61^(1/2))/30))*(x-((61^(1/2)+1)/30)))/(3*x-2) = 0
( x-((1-61^(1/2))/30) )
x-((1-61^(1/2))/30) = 0 // + (1-61^(1/2))/30
x = (1-61^(1/2))/30
( x-((61^(1/2)+1)/30) )
x-((61^(1/2)+1)/30) = 0 // + (61^(1/2)+1)/30
x = (61^(1/2)+1)/30
x in { (1-61^(1/2))/30, (61^(1/2)+1)/30 }
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