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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
5/2 = 65/m // - 65/m
5/2-(65/m) = 0
5/2-65*m^-1 = 0
-65*m^-1 = -5/2 // : -65
m^-1 = 1/26
-1 < 0
1/(m^1) = 1/26 // * m^1
1 = 1/26*m^1 // : 1/26
26 = m^1
m = 26
m = 26
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