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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
1/w-((1/5)*w)-15-3 = (4/5)*w-15 // - (4/5)*w-15
1/w-((1/5)*w)-((4/5)*w)-15-3+15 = 0
(-1/5)*w+(-4/5)*w+1/w-15-3+15 = 0
1*w^-1-1*w^1-3*w^0 = 0
(1*w^0-1*w^2-3*w^1)/(w^1) = 0 // * w^2
w^1*(1*w^0-1*w^2-3*w^1) = 0
w^1
1-w^2-3*w = 0
1-w^2-3*w = 0
DELTA = (-3)^2-(-1*1*4)
DELTA = 13
DELTA > 0
w = (13^(1/2)+3)/(-1*2) or w = (3-13^(1/2))/(-1*2)
w = (13^(1/2)+3)/(-2) or w = (3-13^(1/2))/(-2)
w in { (13^(1/2)+3)/(-2), (3-13^(1/2))/(-2)}
w in { (13^(1/2)+3)/(-2), (3-13^(1/2))/(-2) }
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