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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
1/m = 7/60 // - 7/60
1/m-(7/60) = 0
1/m-7/60 = 0
1*m^-1 = 7/60 // : 1
m^-1 = 7/60
-1 < 0
1/(m^1) = 7/60 // * m^1
1 = 7/60*m^1 // : 7/60
60/7 = m^1
m = 60/7
m = 60/7
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