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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:0) U (0:1) U (1:+oo)
t_1 = 0
t_1-12*(x-1)^-1+x+x^-1 = 0
t_1-12/(x-1)+x+1/x = 0
(-12*x)/(x*(x-1))+(t_1*x*(x-1))/(x*(x-1))+(x^2*(x-1))/(x*(x-1))+(1*(x-1))/(x*(x-1)) = 0
t_1*x*(x-1)+x^2*(x-1)+1*(x-1)-12*x = 0
t_1*x^2-(t_1*x)+x^3-x^2-12*x+x-1 = 0
t_1*x^2-(t_1*x)+x^3-x^2-11*x-1 = 0
t_1*x^2-(t_1*x)+x^3-x^2-11*x-1 = 0
t_1*x^2-(t_1*x)+x^3-x^2-11*x-1
t_1*x*(x-1)+x^3-x^2-11*x-1
x^2*(x-1)+t_1*x*(x-1)-11*x-1
x^2*(x-1)-1*(11*x+1)+t_1*x*(x-1)
(t_1*x+x^2)*(x-1)-1*(11*x+1)
0*(t_1*x+x^2)
(0*(t_1*x+x^2))/(x*(x-1)) = 0
(0*(t_1*x+x^2))/(x*(x-1)) = 0 // * x*(x-1)
0*(t_1*x+x^2) = 0
t_1*x+x^2 = 0
x*(t_1+x) = 0
t_1+x = 0 // - t_1
x = -t_1
x*(t_1+x) = 0
0*x*(t_1+x) = 0
( t_1+x )
t_1+x = 0 // - t_1
x = -t_1
( x )
x = 0
x in { 0}
x belongs to the empty set
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