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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
65/m = 130/m // - 130/m
65/m-(130/m) = 0
65/m-130*m^-1 = 0
-65*m^-1 = 0 // : -65
m^-1 = 0
m naleu017Cy do O
m belongs to the empty set
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