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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:-4) U (-4:0) U (0:+oo)
7/(2*w+8)+4 = -(3/w-4) // + 3/w-4
7/(2*w+8)+3/w-4+4 = 0
(7*w)/(w*(2*w+8))+(3*(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
3*(2*w+8)-4*w*(2*w+8)+4*w*(2*w+8)+7*w = 0
8*w^2-8*w^2+13*w-32*w+32*w+24 = 0
8*w^2-8*w^2-19*w+32*w+24 = 0
13*w+24 = 0
(13*w+24)/(w*(2*w+8)) = 0
(13*w+24)/(w*(2*w+8)) = 0 // * w*(2*w+8)
13*w+24 = 0
13*w+24 = 0 // - 24
13*w = -24 // : 13
w = -24/13
w = -24/13
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