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D( x )
x+2 = 0
x+2 = 0
x+2 = 0
x+2 = 0 // - 2
x = -2
x in (-oo:-2) U (-2:+oo)
(x+3)/(x+2) = 0
x+3 = 0 // - 3
x = -3
x = -3
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