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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
120/m = 10 // - 10
120/m-10 = 0
120*m^-1 = 10 // : 120
m^-1 = 1/12
-1 < 0
1/(m^1) = 1/12 // * m^1
1 = 1/12*m^1 // : 1/12
12 = m^1
m = 12
m = 12
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