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D( w )
4*w+16 = 0
w = 0
4*w+16 = 0
4*w+16 = 0
4*w+16 = 0 // - 16
4*w = -16 // : 4
w = -16/4
w = -4
w = 0
w = 0
w in (-oo:-4) U (-4:0) U (0:+oo)
7/w+4 = 1-5/(4*w+16) // - 1-5/(4*w+16)
7/w-(-5/(4*w+16))-1+4 = 0
5*(4*w+16)^-1+7/w-1+4 = 0
5/(4*w+16)+7/w-1+4 = 0
(5*w)/(w*(4*w+16))+(7*(4*w+16))/(w*(4*w+16))+(-1*w*(4*w+16))/(w*(4*w+16))+(4*w*(4*w+16))/(w*(4*w+16)) = 0
7*(4*w+16)-1*w*(4*w+16)+4*w*(4*w+16)+5*w = 0
16*w^2-4*w^2+33*w-16*w+64*w+112 = 0
16*w^2-4*w^2+17*w+64*w+112 = 0
12*w^2+81*w+112 = 0
12*w^2+81*w+112 = 0
12*w^2+81*w+112 = 0
DELTA = 81^2-(4*12*112)
DELTA = 1185
DELTA > 0
w = (1185^(1/2)-81)/(2*12) or w = (-1185^(1/2)-81)/(2*12)
w = (1185^(1/2)-81)/24 or w = (-(1185^(1/2)+81))/24
(w+(1185^(1/2)+81)/24)*(w-((1185^(1/2)-81)/24)) = 0
((w+(1185^(1/2)+81)/24)*(w-((1185^(1/2)-81)/24)))/(w*(4*w+16)) = 0
((w+(1185^(1/2)+81)/24)*(w-((1185^(1/2)-81)/24)))/(w*(4*w+16)) = 0 // * w*(4*w+16)
(w+(1185^(1/2)+81)/24)*(w-((1185^(1/2)-81)/24)) = 0
( w+(1185^(1/2)+81)/24 )
w+(1185^(1/2)+81)/24 = 0 // - (1185^(1/2)+81)/24
w = -((1185^(1/2)+81)/24)
( w-((1185^(1/2)-81)/24) )
w-((1185^(1/2)-81)/24) = 0 // + (1185^(1/2)-81)/24
w = (1185^(1/2)-81)/24
w in { -((1185^(1/2)+81)/24), (1185^(1/2)-81)/24 }
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