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D( x )
x-2 = 0
3*x-9 = 0
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
3*x-9 = 0
3*x-9 = 0
3*x-9 = 0 // + 9
3*x = 9 // : 3
x = 9/3
x = 3
x in (-oo:2) U (2:3) U (3:+oo)
(((x^2-x-6)/(x-2))*(x+1))/(3*x-9) = 0
((x^2-x-6)*(x+1))/((x-2)*(3*x-9)) = 0
x^2-x-6 = 0
x^2-x-6 = 0
DELTA = (-1)^2-(-6*1*4)
DELTA = 25
DELTA > 0
x = (25^(1/2)+1)/(1*2) or x = (1-25^(1/2))/(1*2)
x = 3 or x = -2
(x+2)*(x-3) = 0
((x+2)*(x-3)*(x+1))/((x-2)*(3*x-9)) = 0
( x+1 )
x+1 = 0 // - 1
x = -1
( x+2 )
x+2 = 0 // - 2
x = -2
( x-3 )
x-3 = 0 // + 3
x = 3
x in { 3}
x in { -1, -2 }
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