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D( x )
x+4 = 0
x+4 = 0
x+4 = 0
x+4 = 0 // - 4
x = -4
x in (-oo:-4) U (-4:+oo)
(((x+3)^2*(2-x))/(x+4))*(x^2-4) = 0
((x+3)^2*(2-x)*(x^2-4))/(x+4) = 0
( 2-x )
2-x = 0 // - 2
-x = -2 // * -1
x = 2
( x+3 )
x+3 = 0 // - 3
x = -3
( x^2-4 )
1*x^2 = 4 // : 1
x^2 = 4
x^2 = 4 // ^ 1/2
abs(x) = 2
x = 2 or x = -2
x in { 2, -3, -3, 2, -2 }
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