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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
56/m = 8 // - 8
56/m-8 = 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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