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D( x )
x^2-(5*x)+6 = 0
(x^2-16)/(x+3) = 0
x+3 = 0
x^2-(5*x)+6 = 0
x^2-(5*x)+6 = 0
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 = (5-1^(1/2))/(1*2)
x = 3 or x = 2
(x^2-16)/(x+3) = 0
(x^2-16)/(x+3) = 0
1*x^2 = 16 // : 1
x^2 = 16
x^2 = 16 // ^ 1/2
abs(x) = 4
x = 4 or x = -4
x+3 = 0
x+3 = 0
x+3 = 0 // - 3
x = -3
x in (-oo:-4) U (-4:-3) U (-3:2) U (2:3) U (3:4) U (4:+oo)
((x+4)/(x^2-(5*x)+6))/((x^2-16)/(x+3)) = 0
((x+4)/(x^2-5*x+6))/((x^2-16)/(x+3)) = 0
((x+4)*(x+3))/((x^2-5*x+6)*(x^2-16)) = 0
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 = (5-1^(1/2))/(1*2)
x = 3 or x = 2
(x-2)*(x-3) = 0
((x+4)*(x+3))/((x-2)*(x-3)*(x^2-16)) = 0
( x+3 )
x+3 = 0 // - 3
x = -3
( x+4 )
x+4 = 0 // - 4
x = -4
x in { -3}
x in { -4}
x belongs to the empty set
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