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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
30/m+(5*m)/m-6-6 = 0
30*m^-1 = 7 // : 30
m^-1 = 7/30
-1 < 0
1/(m^1) = 7/30 // * m^1
1 = 7/30*m^1 // : 7/30
30/7 = m^1
m = 30/7
m = 30/7
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