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D( w )
2*w-10 = 0
w = 0
2*w-10 = 0
2*w-10 = 0
2*w-10 = 0 // + 10
2*w = 10 // : 2
w = 10/2
w = 5
w = 0
w = 0
w in (-oo:0) U (0:5) U (5:+oo)
-3/w-5 = 2-1/(2*w-10) // - 2-1/(2*w-10)
-(-1/(2*w-10))-3/w-5-2 = 0
(2*w-10)^-1-3/w-5-2 = 0
1/(2*w-10)-3/w-5-2 = 0
w/(w*(2*w-10))+(-3*(2*w-10))/(w*(2*w-10))+(-5*w*(2*w-10))/(w*(2*w-10))+(-2*w*(2*w-10))/(w*(2*w-10)) = 0
w-3*(2*w-10)-5*w*(2*w-10)-2*w*(2*w-10) = 0
50*w-10*w^2-4*w^2-5*w+20*w+30 = 0
45*w-10*w^2-4*w^2+20*w+30 = 0
65*w-14*w^2+30 = 0
65*w-14*w^2+30 = 0
65*w-14*w^2+30 = 0
DELTA = 65^2-(-14*4*30)
DELTA = 5905
DELTA > 0
w = (5905^(1/2)-65)/(-14*2) or w = (-5905^(1/2)-65)/(-14*2)
w = (5905^(1/2)-65)/(-28) or w = (5905^(1/2)+65)/28
(w-((5905^(1/2)-65)/(-28)))*(w-((5905^(1/2)+65)/28)) = 0
((w-((5905^(1/2)-65)/(-28)))*(w-((5905^(1/2)+65)/28)))/(w*(2*w-10)) = 0
((w-((5905^(1/2)-65)/(-28)))*(w-((5905^(1/2)+65)/28)))/(w*(2*w-10)) = 0 // * w*(2*w-10)
(w-((5905^(1/2)-65)/(-28)))*(w-((5905^(1/2)+65)/28)) = 0
( w-((5905^(1/2)+65)/28) )
w-((5905^(1/2)+65)/28) = 0 // + (5905^(1/2)+65)/28
w = (5905^(1/2)+65)/28
( w-((5905^(1/2)-65)/(-28)) )
w-((5905^(1/2)-65)/(-28)) = 0 // + (5905^(1/2)-65)/(-28)
w = (5905^(1/2)-65)/(-28)
w in { (5905^(1/2)+65)/28, (5905^(1/2)-65)/(-28) }
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