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D( x )
x-5 = 0
x-3 = 0
x-5 = 0
x-5 = 0
x-5 = 0 // + 5
x = 5
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x in (-oo:3) U (3:5) U (5:+oo)
(x-6)/(x-3) = (x-1)/(x-5)+1 // - (x-1)/(x-5)+1
(x-6)/(x-3)-((x-1)/(x-5))-1 = 0
(x-6)/(x-3)+(-1*(x-1))/(x-5)-1 = 0
((x-6)*(x-5))/((x-3)*(x-5))+(-1*(x-1)*(x-3))/((x-3)*(x-5))+(-1*(x-3)*(x-5))/((x-3)*(x-5)) = 0
(x-6)*(x-5)-1*(x-1)*(x-3)-1*(x-3)*(x-5) = 0
8*x-x^2-7*x-15+27 = 0
x-x^2+12 = 0
x-x^2+12 = 0
x-x^2+12 = 0
DELTA = 1^2-(-1*4*12)
DELTA = 49
DELTA > 0
x = (49^(1/2)-1)/(-1*2) or x = (-49^(1/2)-1)/(-1*2)
x = -3 or x = 4
(x+3)*(x-4) = 0
((x+3)*(x-4))/((x-3)*(x-5)) = 0
((x+3)*(x-4))/((x-3)*(x-5)) = 0 // * (x-3)*(x-5)
(x+3)*(x-4) = 0
( x+3 )
x+3 = 0 // - 3
x = -3
( x-4 )
x-4 = 0 // + 4
x = 4
x in { -3, 4 }
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