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D( y )
y = 0
y+1 = 0
y = 0
y = 0
y+1 = 0
y+1 = 0
y+1 = 0 // - 1
y = -1
y in (-oo:-1) U (-1:0) U (0:+oo)
t_1 = 0
1/(y+1)-5*(y+1)^-1+t_1-1/5*y+y^-1 = 0
1/(y+1)-5/(y+1)+t_1-y/5+1/y = 0
(1*5*y)/(5*y*(y+1))+(-5*5*y)/(5*y*(y+1))+(5*t_1*y*(y+1))/(5*y*(y+1))+(-y*y*(y+1))/(5*y*(y+1))+(1*5*(y+1))/(5*y*(y+1)) = 0
5*t_1*y*(y+1)-y*y*(y+1)+1*5*(y+1)+1*5*y-5*5*y = 0
5*t_1*y^2+5*t_1*y-y^3-y^2-20*y+5*y+5 = 0
5*t_1*y^2+5*t_1*y-y^3-y^2-15*y+5 = 0
5*t_1*y^2+5*t_1*y-y^3-y^2-15*y+5 = 0
5*t_1*y^2+5*t_1*y-y^3-y^2-15*y+5
5*t_1*y*(y+1)-y^3-y^2-15*y+5
5*t_1*y*(y+1)-y^2*(y+1)-15*y+5
5*(1-3*y)-y^2*(y+1)+5*t_1*y*(y+1)
(5*t_1*y-y^2)*(y+1)+5*(1-3*y)
6*(5*t_1*y-y^2)
(6*(5*t_1*y-y^2))/(5*y*(y+1)) = 0
(6*(5*t_1*y-y^2))/(5*y*(y+1)) = 0 // * 5*y*(y+1)
6*(5*t_1*y-y^2) = 0
5*t_1*y-y^2 = 0
y*(5*t_1-y) = 0
5*t_1-y = 0 // - 5*t_1
-y = -(5*t_1) // * -1
y = 5*t_1
y*(y-5*t_1) = 0
6*y*(y-5*t_1) = 0
( y-5*t_1 )
y-5*t_1 = 0 // + -5*t_1
y = -(-5*t_1)
y = 5*t_1
( y )
y = 0
y in { 0*5}
y in { 0}
y belongs to the empty set
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