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