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D( x )
x+1 = 0
4*x+4 = 0
x+1 = 0
x+1 = 0
x+1 = 0 // - 1
x = -1
4*x+4 = 0
4*x+4 = 0
4*x+4 = 0 // - 4
4*x = -4 // : 4
x = -4/4
x = -1
x in (-oo:-1) U (-1:+oo)
(x-1)/(x+1)-((1/3)*x) = (3*x-5)/(4*x+4) // - (3*x-5)/(4*x+4)
(x-1)/(x+1)-((3*x-5)/(4*x+4))-((1/3)*x) = 0
(x-1)/(x+1)-((3*x-5)/(4*x+4))+(-1/3)*x = 0
(x-1)/(x+1)+(-1*(3*x-5))/(4*x+4)-x/3 = 0
(3*(x-1)*(4*x+4))/(3*(x+1)*(4*x+4))+(-1*3*(3*x-5)*(x+1))/(3*(x+1)*(4*x+4))+(-x*(x+1)*(4*x+4))/(3*(x+1)*(4*x+4)) = 0
3*(x-1)*(4*x+4)-1*3*(3*x-5)*(x+1)-x*(x+1)*(4*x+4) = 0
3*x^2-4*x^3-8*x^2+6*x-4*x+3 = 0
2*x-4*x^3-5*x^2+3 = 0
2*x-4*x^3-5*x^2+3 = 0
2*x-4*x^3-5*x^2+3 = 0
{ 1, -1, 3, -3 }
1
x = 1
2*x-4*x^3-5*x^2+3 = -4
1
-1
x = -1
2*x-4*x^3-5*x^2+3 = 0
-1
x+1
3-4*x^2-x
2*x-4*x^3-5*x^2+3
x+1
4*x^3+4*x^2
2*x-x^2+3
x^2+x
3*x+3
-3*x-3
0
3-4*x^2-x = 0
DELTA = (-1)^2-(-4*3*4)
DELTA = 49
DELTA > 0
x = (49^(1/2)+1)/(-4*2) or x = (1-49^(1/2))/(-4*2)
x = -1 or x = 3/4
x in { -1, 3/4, -1}
(x+1)^2*(x-3/4) = 0
((x+1)^2*(x-3/4))/(3*(x+1)*(4*x+4)) = 0
((x+1)^2*(x-3/4))/(3*(x+1)*(4*x+4)) = 0 // * 3*(x+1)*(4*x+4)
(x+1)^2*(x-3/4) = 0
( x+1 )
x+1 = 0 // - 1
x = -1
( x-3/4 )
x-3/4 = 0 // + 3/4
x = 3/4
x in { -1}
x = 3/4
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