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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
9/m+7 = 45/55 // - 45/55
9/m-(45/55)+7 = 0
9/m-9/11+7 = 0
9*m^-1 = -68/11 // : 9
m^-1 = -68/99
-1 < 0
1/(m^1) = -68/99 // * m^1
1 = -68/99*m^1 // : -68/99
-99/68 = m^1
m = -99/68
m = -99/68
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