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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
3/14 = 15/m-3 // - 15/m-3
3/14-(15/m)+3 = 0
3/14-15*m^-1+3 = 0
-15*m^-1 = -45/14 // : -15
m^-1 = 3/14
-1 < 0
1/(m^1) = 3/14 // * m^1
1 = 3/14*m^1 // : 3/14
14/3 = m^1
m = 14/3
m = 14/3
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