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D( w )
2*w-8 = 0
w = 0
2*w-8 = 0
2*w-8 = 0
2*w-8 = 0 // + 8
2*w = 8 // : 2
w = 8/2
w = 4
w = 0
w = 0
w in (-oo:0) U (0:4) U (4:+oo)
7/w-4 = 4-5/(2*w-8) // - 4-5/(2*w-8)
7/w-(-5/(2*w-8))-4-4 = 0
5*(2*w-8)^-1+7/w-4-4 = 0
5/(2*w-8)+7/w-4-4 = 0
(5*w)/(w*(2*w-8))+(7*(2*w-8))/(w*(2*w-8))+(-4*w*(2*w-8))/(w*(2*w-8))+(-4*w*(2*w-8))/(w*(2*w-8)) = 0
7*(2*w-8)-4*w*(2*w-8)-4*w*(2*w-8)+5*w = 0
19*w-8*w^2-8*w^2+32*w+32*w-56 = 0
51*w-8*w^2-8*w^2+32*w-56 = 0
83*w-16*w^2-56 = 0
83*w-16*w^2-56 = 0
83*w-16*w^2-56 = 0
DELTA = 83^2-(-56*(-16)*4)
DELTA = 3305
DELTA > 0
w = (3305^(1/2)-83)/(-16*2) or w = (-3305^(1/2)-83)/(-16*2)
w = (3305^(1/2)-83)/(-32) or w = (3305^(1/2)+83)/32
(w-((3305^(1/2)-83)/(-32)))*(w-((3305^(1/2)+83)/32)) = 0
((w-((3305^(1/2)-83)/(-32)))*(w-((3305^(1/2)+83)/32)))/(w*(2*w-8)) = 0
((w-((3305^(1/2)-83)/(-32)))*(w-((3305^(1/2)+83)/32)))/(w*(2*w-8)) = 0 // * w*(2*w-8)
(w-((3305^(1/2)-83)/(-32)))*(w-((3305^(1/2)+83)/32)) = 0
( w-((3305^(1/2)+83)/32) )
w-((3305^(1/2)+83)/32) = 0 // + (3305^(1/2)+83)/32
w = (3305^(1/2)+83)/32
( w-((3305^(1/2)-83)/(-32)) )
w-((3305^(1/2)-83)/(-32)) = 0 // + (3305^(1/2)-83)/(-32)
w = (3305^(1/2)-83)/(-32)
w in { (3305^(1/2)+83)/32, (3305^(1/2)-83)/(-32) }
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