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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
2/10 = 6/m // - 6/m
2/10-(6/m) = 0
2/10-6*m^-1 = 0
-6*m^-1 = -1/5 // : -6
m^-1 = 1/30
-1 < 0
1/(m^1) = 1/30 // * m^1
1 = 1/30*m^1 // : 1/30
30 = m^1
m = 30
m = 30
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