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