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D( x )
x^3-(2*x^2)-(3*x) = 0
x^3-(2*x^2)-(3*x) = 0
x^3-(2*x^2)-(3*x) = 0
x^3-2*x^2-3*x = 0
x^3-2*x^2-3*x = 0
x*(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 = 0
x = 0
x in (-oo:-1) U (-1:0) U (0:3) U (3:+oo)
(7-(9*x))/(x^3-(2*x^2)-(3*x)) = 0
(7-9*x)/(x^3-2*x^2-3*x) = 0
x^3-2*x^2-3*x = 0
x*(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*(x+1)*(x-3) = 0
(7-9*x)/(x*(x+1)*(x-3)) = 0
7-9*x = 0 // - 7
-9*x = -7 // : -9
x = -7/(-9)
x = 7/9
x = 7/9
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