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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
(3/m)/7 = 12 // - 12
(3/m)/7-12 = 0
3/7*m^-1 = 12 // : 3/7
m^-1 = 28
-1 < 0
1/(m^1) = 28 // * m^1
1 = 28*m^1 // : 28
1/28 = m^1
m = 1/28
m = 1/28
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