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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
1/w-((1/5)*w)-3+15 = (4/5)*w-15 // - (4/5)*w-15
1/w-((1/5)*w)-((4/5)*w)-3+15+15 = 0
(-1/5)*w+(-4/5)*w+1/w-3+15+15 = 0
1*w^-1-1*w^1+27*w^0 = 0
(27*w^1-1*w^2+1*w^0)/(w^1) = 0 // * w^2
w^1*(27*w^1-1*w^2+1*w^0) = 0
w^1
27*w-w^2+1 = 0
27*w-w^2+1 = 0
DELTA = 27^2-(-1*1*4)
DELTA = 733
DELTA > 0
w = (733^(1/2)-27)/(-1*2) or w = (-733^(1/2)-27)/(-1*2)
w = (733^(1/2)-27)/(-2) or w = (733^(1/2)+27)/2
w in { (733^(1/2)-27)/(-2), (733^(1/2)+27)/2}
w in { (733^(1/2)-27)/(-2), (733^(1/2)+27)/2 }
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