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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-(4*x)-7)/(3*x-2) = 0
(15*x^2-4*x-7)/(3*x-2) = 0
15*x^2-4*x-7 = 0
15*x^2-4*x-7 = 0
DELTA = (-4)^2-(-7*4*15)
DELTA = 436
DELTA > 0
x = (436^(1/2)+4)/(2*15) or x = (4-436^(1/2))/(2*15)
x = (2*109^(1/2)+4)/30 or x = (4-2*109^(1/2))/30
(x-((4-2*109^(1/2))/30))*(x-((2*109^(1/2)+4)/30)) = 0
((x-((4-2*109^(1/2))/30))*(x-((2*109^(1/2)+4)/30)))/(3*x-2) = 0
( x-((2*109^(1/2)+4)/30) )
x-((2*109^(1/2)+4)/30) = 0 // + (2*109^(1/2)+4)/30
x = (2*109^(1/2)+4)/30
( x-((4-2*109^(1/2))/30) )
x-((4-2*109^(1/2))/30) = 0 // + (4-2*109^(1/2))/30
x = (4-2*109^(1/2))/30
x in { (2*109^(1/2)+4)/30, (4-2*109^(1/2))/30 }
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