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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
12-(4/x) = 12 // - 12
12-(4/x)-12 = 0
12-4*x^-1-12 = 0
-4*x^-1 = 0 // : -4
x^-1 = 0
x naleu017Cy do O
x belongs to the empty set
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