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D( x )
x+1 = 0
x+1 = 0
x+1 = 0
x+1 = 0 // - 1
x = -1
x in (-oo:-1) U (-1:+oo)
t_1 = 0
1/(x+1)+t_1+x^5+x^4+x^3+x^2 = 0
1/(x+1)+(t_1*(x+1))/(x+1)+(x^5*(x+1))/(x+1)+(x^4*(x+1))/(x+1)+(x^3*(x+1))/(x+1)+(x^2*(x+1))/(x+1) = 0
t_1*(x+1)+x^5*(x+1)+x^4*(x+1)+x^3*(x+1)+x^2*(x+1)+1 = 0
t_1*x+t_1+x^6+x^5+x^5+x^4+x^4+x^3+x^3+x^2+1 = 0
t_1*x+t_1+x^6+2*x^5+x^4+x^4+x^3+x^3+x^2+1 = 0
t_1*x+t_1+x^6+2*x^5+2*x^4+x^3+x^3+x^2+1 = 0
t_1*x+t_1+x^6+2*x^5+2*x^4+2*x^3+x^2+1 = 0
t_1*x+t_1+x^6+2*x^5+2*x^4+2*x^3+x^2+1 = 0
t_1*x+t_1+x^6+2*x^5+2*x^4+2*x^3+x^2+1
t_1*(x+1)+x^6+2*x^5+2*x^4+2*x^3+x^2+1
x^2*(x^4+1)+t_1*(x+1)+2*x^5+2*x^4+2*x^3+1
2*x^4*(x+1)+x^2*(x^4+1)+t_1*(x+1)+2*x^3+1
(t_1+2*x^4)*(x+1)+x^2*(x^4+1)+2*x^3+1
(x^2+1)*(t_1+2*x^4)+2*x^3+1
2*(x^2+1)
(2*(x^2+1))/(x+1) = 0
(2*(x^2+1))/(x+1) = 0 // * x+1
2*(x^2+1) = 0
1*x^2 = -1 // : 1
x^2 = -1
x belongs to the empty set
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