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D( x )
x^2-x-6 = 0
x^2-x-6 = 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 in (-oo:-2) U (-2:3) U (3:+oo)
(8*x-48)/(x^2-x-6) = 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
(8*x-48)/((x+2)*(x-3)) = 0
8*x-48 = 0 // + 48
8*x = 48 // : 8
x = 48/8
x = 6
x = 6
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