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D( x )
x-1 = 0
x+8 = 0
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x+8 = 0
x+8 = 0
x+8 = 0 // - 8
x = -8
x in (-oo:-8) U (-8:1) U (1:+oo)
11/(x+8)-4 = -6/(x-1) // + -6/(x-1)
11/(x+8)-(-6/(x-1))-4 = 0
11/(x+8)+6*(x-1)^-1-4 = 0
11/(x+8)+6/(x-1)-4 = 0
(11*(x-1))/((x+8)*(x-1))+(6*(x+8))/((x+8)*(x-1))+(-4*(x+8)*(x-1))/((x+8)*(x-1)) = 0
11*(x-1)+6*(x+8)-4*(x+8)*(x-1) = 0
17*x-4*x^2-28*x+32+37 = 0
69-4*x^2-11*x = 0
69-4*x^2-11*x = 0
69-4*x^2-11*x = 0
DELTA = (-11)^2-(-4*4*69)
DELTA = 1225
DELTA > 0
x = (1225^(1/2)+11)/(-4*2) or x = (11-1225^(1/2))/(-4*2)
x = -23/4 or x = 3
(x+23/4)*(x-3) = 0
((x+23/4)*(x-3))/((x+8)*(x-1)) = 0
((x+23/4)*(x-3))/((x+8)*(x-1)) = 0 // * (x+8)*(x-1)
(x+23/4)*(x-3) = 0
( x+23/4 )
x+23/4 = 0 // - 23/4
x = -23/4
( x-3 )
x-3 = 0 // + 3
x = 3
x in { -23/4, 3 }
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