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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
9/m = 7 // - 7
9/m-7 = 0
9*m^-1 = 7 // : 9
m^-1 = 7/9
-1 < 0
1/(m^1) = 7/9 // * m^1
1 = 7/9*m^1 // : 7/9
9/7 = m^1
m = 9/7
m = 9/7
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