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D( x )
x^2-1 = 0
x+1 = 0
x-1 = 0
x^2-1 = 0
x^2-1 = 0
1*x^2 = 1 // : 1
x^2 = 1
x^2 = 1 // ^ 1/2
abs(x) = 1
x = 1 or x = -1
x+1 = 0
x+1 = 0
x+1 = 0 // - 1
x = -1
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:-1) U (-1:1) U (1:+oo)
6/(x+1)-(5/(x-1)) = (3*x)/(x^2-1) // - (3*x)/(x^2-1)
6/(x+1)-(5/(x-1))-((3*x)/(x^2-1)) = 0
6/(x+1)-5*(x-1)^-1-3*x*(x^2-1)^-1 = 0
6/(x+1)-5/(x-1)+(-3*x)/(x^2-1) = 0
(6*(x-1)*(x^2-1))/((x+1)*(x-1)*(x^2-1))+(-5*(x+1)*(x^2-1))/((x+1)*(x-1)*(x^2-1))+(-3*x*(x+1)*(x-1))/((x+1)*(x-1)*(x^2-1)) = 0
6*(x-1)*(x^2-1)-5*(x+1)*(x^2-1)-3*x*(x+1)*(x-1) = 0
x^3-3*x^3-11*x^2-x+3*x+11 = 0
2*x-2*x^3-11*x^2+11 = 0
2*x-2*x^3-11*x^2+11 = 0
2*x-2*x^3-11*x^2+11
11*(1-x^2)-2*x^3+2*x
2*x*(1-x^2)+11*(1-x^2)
(2*x+11)*(1-x^2)
((2*x+11)*(1-x^2))/((x+1)*(x-1)*(x^2-1)) = 0
((2*x+11)*(1-x^2))/((x+1)*(x-1)*(x^2-1)) = 0 // * (x+1)*(x-1)*(x^2-1)
(2*x+11)*(1-x^2) = 0
( 1-x^2 )
-1*x^2 = -1 // : -1
x^2 = 1
x^2 = 1 // ^ 1/2
abs(x) = 1
x = 1 or x = -1
( 2*x+11 )
2*x+11 = 0 // - 11
2*x = -11 // : 2
x = -11/2
x in { 1}
x in { -1}
x = -11/2
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