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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x-2 = 16/x-2 // - 16/x-2
4/x-(16/x)-2+2 = 0
4/x-16*x^-1-2+2 = 0
-12*x^-1 = 0 // : -12
x^-1 = 0
x należy do O
x belongs to the empty set
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