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D( x )
3*x-9 = 0
x^2-(3*x)+2 = 0
3*x-9 = 0
3*x-9 = 0
3*x-9 = 0 // + 9
3*x = 9 // : 3
x = 9/3
x = 3
x^2-(3*x)+2 = 0
x^2-(3*x)+2 = 0
x^2-3*x+2 = 0
x^2-3*x+2 = 0
DELTA = (-3)^2-(1*2*4)
DELTA = 1
DELTA > 0
x = (1^(1/2)+3)/(1*2) or x = (3-1^(1/2))/(1*2)
x = 2 or x = 1
x in (-oo:1) U (1:2) U (2:3) U (3:+oo)
((x^2-(2*x)-3)/(x^2-(3*x)+2))*((x-2)/(3*x-9)) = 0
((x^2-2*x-3)/(x^2-3*x+2))*((x-2)/(3*x-9)) = 0
((x^2-2*x-3)*(x-2))/((x^2-3*x+2)*(3*x-9)) = 0
x^2-2*x-3 = 0
x^2-2*x-3 = 0
DELTA = (-2)^2-(-3*1*4)
DELTA = 16
DELTA > 0
x = (16^(1/2)+2)/(1*2) or x = (2-16^(1/2))/(1*2)
x = 3 or x = -1
(x+1)*(x-3) = 0
x^2-3*x+2 = 0
x^2-3*x+2 = 0
DELTA = (-3)^2-(1*2*4)
DELTA = 1
DELTA > 0
x = (1^(1/2)+3)/(1*2) or x = (3-1^(1/2))/(1*2)
x = 2 or x = 1
(x-1)*(x-2) = 0
((x+1)*(x-3))/((x-1)*(3*x-9)) = 0
( x+1 )
x+1 = 0 // - 1
x = -1
( x-3 )
x-3 = 0 // + 3
x = 3
x in { 3}
x = -1
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