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D( y )
y = 0
1-y = 0
y = 0
y = 0
1-y = 0
1-y = 0
1-y = 0 // - 1
-y = -1 // * -1
y = 1
y in (-oo:0) U (0:1) U (1:+oo)
3-((3/y)/(1-y))-1 = 0
3-3*y^-1*(1-y)^-1-1 = 0
(-3*y^-1)/(1-y)-1+3 = 0
(-3*y^-1)/(1-y)+(-1*(1-y))/(1-y)+(3*(1-y))/(1-y) = 0
3*(1-y)-1*(1-y)-3/y = 0
y-3*y-3*y^-1-1+3 = 0
2-2*y-3*y^-1 = 0
2-2*y-3*y^-1 = 0
2*y^0-2*y^1-3*y^-1 = 0
(2*y^1-2*y^2-3*y^0)/(y^1) = 0 // * y^2
y^1*(2*y^1-2*y^2-3*y^0) = 0
y^1
2*y-2*y^2-3 = 0
2*y-2*y^2-3 = 0
DELTA = 2^2-(-3*(-2)*4)
DELTA = -20
DELTA < 0
y in { }
1 = 0
1/(1-y) = 0
1/(1-y) = 0 // * 1-y
1 = 0
y belongs to the empty set
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