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D( x )
x+1 = 0
x-1 = 0
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)
x/(x+1)-(3/(x-1)) = 2 // - 2
x/(x+1)-(3/(x-1))-2 = 0
x/(x+1)-3*(x-1)^-1-2 = 0
x/(x+1)-3/(x-1)-2 = 0
(x*(x-1))/((x+1)*(x-1))+(-3*(x+1))/((x+1)*(x-1))+(-2*(x+1)*(x-1))/((x+1)*(x-1)) = 0
x*(x-1)-3*(x+1)-2*(x+1)*(x-1) = 0
x^2-2*x^2-4*x-3+2 = 0
-x^2-4*x-1 = 0
-x^2-4*x-1 = 0
-1*(x^2+4*x+1) = 0
x^2+4*x+1 = 0
DELTA = 4^2-(1*1*4)
DELTA = 12
DELTA > 0
x = (12^(1/2)-4)/(1*2) or x = (-12^(1/2)-4)/(1*2)
x = (2*3^(1/2)-4)/2 or x = (-2*3^(1/2)-4)/2
-1*(x-((-2*3^(1/2)-4)/2))*(x-((2*3^(1/2)-4)/2)) = 0
(-1*(x-((-2*3^(1/2)-4)/2))*(x-((2*3^(1/2)-4)/2)))/((x+1)*(x-1)) = 0
(-1*(x-((-2*3^(1/2)-4)/2))*(x-((2*3^(1/2)-4)/2)))/((x+1)*(x-1)) = 0 // * (x+1)*(x-1)
-1*(x-((-2*3^(1/2)-4)/2))*(x-((2*3^(1/2)-4)/2)) = 0
( x-((-2*3^(1/2)-4)/2) )
x-((-2*3^(1/2)-4)/2) = 0 // + (-2*3^(1/2)-4)/2
x = (-2*3^(1/2)-4)/2
( x-((2*3^(1/2)-4)/2) )
x-((2*3^(1/2)-4)/2) = 0 // + (2*3^(1/2)-4)/2
x = (2*3^(1/2)-4)/2
x in { (-2*3^(1/2)-4)/2, (2*3^(1/2)-4)/2 }
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