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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
26/8 = 52/m // - 52/m
26/8-(52/m) = 0
26/8-52*m^-1 = 0
-52*m^-1 = -13/4 // : -52
m^-1 = 1/16
-1 < 0
1/(m^1) = 1/16 // * m^1
1 = 1/16*m^1 // : 1/16
16 = m^1
m = 16
m = 16
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