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D( x )
x-8 = 0
8*x-9 = 0
x-8 = 0
x-8 = 0
x-8 = 0 // + 8
x = 8
8*x-9 = 0
8*x-9 = 0
8*x-9 = 0 // + 9
8*x = 9 // : 8
x = 9/8
x in (-oo:9/8) U (9/8:8) U (8:+oo)
(7*x-6)/(8*x-9) = (x-6)/(x-8) // - (x-6)/(x-8)
(7*x-6)/(8*x-9)-((x-6)/(x-8)) = 0
(7*x-6)/(8*x-9)+(-1*(x-6))/(x-8) = 0
((7*x-6)*(x-8))/((8*x-9)*(x-8))+(-1*(x-6)*(8*x-9))/((8*x-9)*(x-8)) = 0
(7*x-6)*(x-8)-1*(x-6)*(8*x-9) = 0
-x^2-5*x-6 = 0
-x^2-5*x-6 = 0
-1*(x^2+5*x+6) = 0
x^2+5*x+6 = 0
DELTA = 5^2-(1*4*6)
DELTA = 1
DELTA > 0
x = (1^(1/2)-5)/(1*2) or x = (-1^(1/2)-5)/(1*2)
x = -2 or x = -3
-1*(x+3)*(x+2) = 0
(-1*(x+3)*(x+2))/((8*x-9)*(x-8)) = 0
(-1*(x+3)*(x+2))/((8*x-9)*(x-8)) = 0 // * (8*x-9)*(x-8)
-1*(x+3)*(x+2) = 0
( x+2 )
x+2 = 0 // - 2
x = -2
( x+3 )
x+3 = 0 // - 3
x = -3
x in { -2, -3 }
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