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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)
x/(3*x) = 1/4 // - 1/4
x/(3*x)-(1/4) = 0
x/(3*x)-1/4 = 0
1/12 = 0
x belongs to the empty set
x belongs to the empty set
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