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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
3*w-((49*(9/35))/w)-3 = 0
3*w+(-63/5)*w^-1-3 = 0
3*w^1-63/5*w^-1-3*w^0 = 0
(3*w^2-3*w^1-63/5*w^0)/(w^1) = 0 // * w^2
w^1*(3*w^2-3*w^1-63/5*w^0) = 0
w^1
3*w^2-3*w-63/5 = 0
3*w^2-3*w-63/5 = 0
DELTA = (-3)^2-(3*4*(-63/5))
DELTA = 801/5
DELTA > 0
w = ((801/5)^(1/2)+3)/(2*3) or w = (3-(801/5)^(1/2))/(2*3)
w = ((801/5)^(1/2)+3)/6 or w = (3-(801/5)^(1/2))/6
w in { (3-(801/5)^(1/2))/6, ((801/5)^(1/2)+3)/6}
w in { (3-(801/5)^(1/2))/6, ((801/5)^(1/2)+3)/6 }
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