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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
5/9 = 7/m // - 7/m
5/9-(7/m) = 0
5/9-7*m^-1 = 0
-7*m^-1 = -5/9 // : -7
m^-1 = 5/63
-1 < 0
1/(m^1) = 5/63 // * m^1
1 = 5/63*m^1 // : 5/63
63/5 = m^1
m = 63/5
m = 63/5
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