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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
(9/7)*w+5/w-6 = 0
9/7*w^1+5*w^-1-6*w^0 = 0
(9/7*w^2-6*w^1+5*w^0)/(w^1) = 0 // * w^2
w^1*(9/7*w^2-6*w^1+5*w^0) = 0
w^1
(9/7)*w^2-6*w+5 = 0
(9/7)*w^2-6*w+5 = 0
DELTA = (-6)^2-(4*5*(9/7))
DELTA = 72/7
DELTA > 0
w = ((72/7)^(1/2)+6)/(2*(9/7)) or w = (6-(72/7)^(1/2))/(2*(9/7))
w = 7/18*((72/7)^(1/2)+6) or w = 7/18*(6-(72/7)^(1/2))
w in { 7/18*(6-(72/7)^(1/2)), 7/18*((72/7)^(1/2)+6)}
w in { 7/18*(6-(72/7)^(1/2)), 7/18*((72/7)^(1/2)+6) }
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