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D( x )
x+7 = 0
x+7 = 0
x+7 = 0
x+7 = 0 // - 7
x = -7
x in (-oo:-7) U (-7:+oo)
(3*x^2+25*x+32)/(x+7) = 0
3*x^2+25*x+32 = 0
3*x^2+25*x+32 = 0
DELTA = 25^2-(3*4*32)
DELTA = 241
DELTA > 0
x = (241^(1/2)-25)/(2*3) or x = (-241^(1/2)-25)/(2*3)
x = (241^(1/2)-25)/6 or x = (-(241^(1/2)+25))/6
(x+(241^(1/2)+25)/6)*(x-((241^(1/2)-25)/6)) = 0
((x+(241^(1/2)+25)/6)*(x-((241^(1/2)-25)/6)))/(x+7) = 0
( x+(241^(1/2)+25)/6 )
x+(241^(1/2)+25)/6 = 0 // - (241^(1/2)+25)/6
x = -((241^(1/2)+25)/6)
( x-((241^(1/2)-25)/6) )
x-((241^(1/2)-25)/6) = 0 // + (241^(1/2)-25)/6
x = (241^(1/2)-25)/6
x in { -((241^(1/2)+25)/6), (241^(1/2)-25)/6 }
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