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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
8 = 56/m // - 56/m
8-(56/m) = 0
8-56*m^-1 = 0
-56*m^-1 = -8 // : -56
m^-1 = 1/7
-1 < 0
1/(m^1) = 1/7 // * m^1
1 = 1/7*m^1 // : 1/7
7 = m^1
m = 7
m = 7
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