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