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D( x )
2*x = 0
2*x = 0
2*x = 0
2*x = 0 // : 2
x = 0
x in (-oo:0) U (0:+oo)
(3*x)/(2*x) = 4 // - 4
(3*x)/(2*x)-4 = 0
-5/2 = 0
x belongs to the empty set
x belongs to the empty set
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