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D( w )
5*w-2 = 0
5*w-(7*w)+2 = 0
w-1 = 0
5*w-2 = 0
5*w-2 = 0
5*w-2 = 0 // + 2
5*w = 2 // : 5
w = 2/5
5*w-(7*w)+2 = 0
5*w-(7*w)+2 = 0
5*w-7*w+2 = 0
2-2*w = 0 // - 2
-2*w = -2 // : -2
w = -2/(-2)
w = 1
w-1 = 0
w-1 = 0
w-1 = 0 // + 1
w = 1
w in (-oo:2/5) U (2/5:1) U (1:+oo)
w/(w-1)-((5*w)/(5*w-2)) = (w-2)/(5*w-(7*w)+2) // - (w-2)/(5*w-(7*w)+2)
w/(w-1)-((5*w)/(5*w-2))-((w-2)/(5*w-(7*w)+2)) = 0
w/(w-1)-5*w*(5*w-2)^-1-((w-2)/(5*w-7*w+2)) = 0
w/(w-1)+(-5*w)/(5*w-2)+(-1*(w-2))/(2-2*w) = 0
(w*(5*w-2)*(2-2*w))/((w-1)*(5*w-2)*(2-2*w))+(-5*w*(w-1)*(2-2*w))/((w-1)*(5*w-2)*(2-2*w))+(-1*(w-2)*(w-1)*(5*w-2))/((w-1)*(5*w-2)*(2-2*w)) = 0
w*(5*w-2)*(2-2*w)-5*w*(w-1)*(2-2*w)-1*(w-2)*(w-1)*(5*w-2) = 0
17*w^2-5*w^3-6*w^2+6*w-16*w+4 = 0
11*w^2-5*w^3-10*w+4 = 0
11*w^2-5*w^3-10*w+4 = 0
11*w^2-5*w^3-10*w+4 = 0
{ 1, -1, 2, -2, 4, -4 }
1
w = 1
11*w^2-5*w^3-10*w+4 = 0
1
w-1
6*w-5*w^2-4
11*w^2-5*w^3-10*w+4
w-1
5*w^3-5*w^2
6*w^2-10*w+4
6*w-6*w^2
4-4*w
4*w-4
0
6*w-5*w^2-4 = 0
DELTA = 6^2-(-5*(-4)*4)
DELTA = -44
DELTA < 0
w in { 1}
w-1 = 0
(w-1)/((w-1)*(5*w-2)*(2-2*w)) = 0
(w-1)/((w-1)*(5*w-2)*(2-2*w)) = 0 // * (w-1)*(5*w-2)*(2-2*w)
w-1 = 0
w-1 = 0 // + 1
w = 1
w in { 1}
w belongs to the empty set
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