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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x+2 = (3*x)/x-2 // - (3*x)/x-2
x-((3*x)/x)+2+2 = 0
x-3+2+2 = 0
x+1 = 0 // - 1
x = -1
x = -1
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