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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.5/x = 32/x // - 32/x
0.5/x-(32/x) = 0
0.5/x-32*x^-1 = 0
-31.5*x^-1 = 0 // : -31.5
x^-1 = 0
x należy do O
x belongs to the empty set
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