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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)*(3*x-8))/(x+3) = 0
3*x-8 = 0 // + 8
3*x = 8 // : 3
x = 8/3
x = 8/3
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