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D( x )
x+3 = 0
x+3 = 0
x+3 = 0
x+3 = 0 // - 3
x = -3
x in (-oo:-3) U (-3:+oo)
(x^2-9)/(x+3) = 3 // - 3
(x^2-9)/(x+3)-3 = 0
(x^2-9)/(x+3)+(-3*(x+3))/(x+3) = 0
x^2-3*(x+3)-9 = 0
x^2-3*x-18 = 0
x^2-3*x-18 = 0
x^2-3*x-18 = 0
DELTA = (-3)^2-(-18*1*4)
DELTA = 81
DELTA > 0
x = (81^(1/2)+3)/(1*2) or x = (3-81^(1/2))/(1*2)
x = 6 or x = -3
(x+3)*(x-6) = 0
((x+3)*(x-6))/(x+3) = 0
((x+3)*(x-6))/(x+3) = 0 // * x+3
(x+3)*(x-6) = 0
( x+3 )
x+3 = 0 // - 3
x = -3
( x-6 )
x-6 = 0 // + 6
x = 6
x in { -3}
x = 6
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