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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
7 = 36/m // - 36/m
7-(36/m) = 0
7-36*m^-1 = 0
-36*m^-1 = -7 // : -36
m^-1 = 7/36
-1 < 0
1/(m^1) = 7/36 // * m^1
1 = 7/36*m^1 // : 7/36
36/7 = m^1
m = 36/7
m = 36/7
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