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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
4/7 = 44/m // - 44/m
4/7-(44/m) = 0
4/7-44*m^-1 = 0
-44*m^-1 = -4/7 // : -44
m^-1 = 1/77
-1 < 0
1/(m^1) = 1/77 // * m^1
1 = 1/77*m^1 // : 1/77
77 = m^1
m = 77
m = 77
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