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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)+t_1-1/5*y-5/2*y+y^-1 = 0
1/(y+1)+t_1-y/5+(-5*y)/2+1/y = 0
(1*2*5*y)/(2*5*y*(y+1))+(2*5*t_1*y*(y+1))/(2*5*y*(y+1))+(2*(-y)*y*(y+1))/(2*5*y*(y+1))+(-5*5*y*y*(y+1))/(2*5*y*(y+1))+(1*2*5*(y+1))/(2*5*y*(y+1)) = 0
2*5*t_1*y*(y+1)+2*(-y)*y*(y+1)-5*5*y*y*(y+1)+1*2*5*(y+1)+1*2*5*y = 0
10*t_1*y^2+10*t_1*y-2*y^3-25*y^3-2*y^2-25*y^2+10*y+10*y+10 = 0
10*t_1*y^2+10*t_1*y-27*y^3-27*y^2+10*y+10*y+10 = 0
10*t_1*y^2+10*t_1*y-27*y^3-27*y^2+20*y+10 = 0
10*t_1*y^2+10*t_1*y-27*y^3-27*y^2+20*y+10 = 0
10*t_1*y^2+10*t_1*y-27*y^3-27*y^2+20*y+10
10*t_1*y*(y+1)-27*y^3-27*y^2+20*y+10
10*t_1*y*(y+1)-27*y^2*(y+1)+20*y+10
10*(2*y+1)-27*y^2*(y+1)+10*t_1*y*(y+1)
(10*t_1*y-27*y^2)*(y+1)+10*(2*y+1)
11*(10*t_1*y-27*y^2)
(11*(10*t_1*y-27*y^2))/(2*5*y*(y+1)) = 0
(11*(10*t_1*y-27*y^2))/(2*5*y*(y+1)) = 0 // * 2*5*y*(y+1)
11*(10*t_1*y-27*y^2) = 0
10*t_1*y-27*y^2 = 0
y*(10*t_1-27*y) = 0
10*t_1-27*y = 0 // - 10*t_1
-27*y = -(10*t_1) // : -27
y = (-(10*t_1))/(-27)
y = (-10*t_1)/(-27)
y*(y-10/27*t_1) = 0
11*y*(y-10/27*t_1) = 0
( y-10/27*t_1 )
y-10/27*t_1 = 0 // + -10/27*t_1
y = -(-10/27*t_1)
y = 10/27*t_1
( y )
y = 0
y in { 0*10/27}
y in { 0}
y belongs to the empty set
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