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D( x )
abs(x+5) = 0
abs(x+5) = 0
abs(x+5) = 0
abs(x+5) = 0
x in (-oo:+oo)
abs(x+5)
x+5 >= 0
x+5 >= 0 // - 5
x >= -5
x in <-5:+oo)
x+5 = 0
x in (-oo:-5)
-(x+5) = 0
abs(x+5) = 0
/| -(x+5) = 0 i x in (-oo:-5)| x+5 = 0 i x in <-5:+oo)
x in (-oo:-5)
-(x+5) = 0
-x-5 = 0 // + 5
-x = 5 // * -1
x = -5
(-oo:-5)
x in <-5:+oo)
x+5 = 0 // - 5
x = -5
x in (-oo:-5) U (-5:+oo)
(X+5)/abs(x+5) = 0
(X+5)/abs(x+5) = 0
x in (-oo:+oo)
abs(x+5)
x+5 >= 0
x+5 >= 0 // - 5
x >= -5
x in <-5:+oo)
(X+5)/(x+5) = 0
x in (-oo:-5)
(X+5)/(-(x+5)) = 0
(X+5)/abs(x+5) = 0
/| (X+5)/(-(x+5)) = 0 i x in (-oo:-5)| (X+5)/(x+5) = 0 i x in <-5:+oo)
x in (-oo:-5)
(X+5)/(-(x+5)) = 0
(X+5)/(-x-5) = 0
x in <-5:+oo)
(X+5)/(x+5) = 0
x belongs to the empty set
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