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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
150/27 = 120/m // - 120/m
150/27-(120/m) = 0
150/27-120*m^-1 = 0
-120*m^-1 = -50/9 // : -120
m^-1 = 5/108
-1 < 0
1/(m^1) = 5/108 // * m^1
1 = 5/108*m^1 // : 5/108
108/5 = m^1
m = 108/5
m = 108/5
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