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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
9/m+8/m-7+2 = 0
17*m^-1 = 5 // : 17
m^-1 = 5/17
-1 < 0
1/(m^1) = 5/17 // * m^1
1 = 5/17*m^1 // : 5/17
17/5 = m^1
m = 17/5
m = 17/5
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