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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
17/7 = 85/m // - 85/m
17/7-(85/m) = 0
17/7-85*m^-1 = 0
-85*m^-1 = -17/7 // : -85
m^-1 = 1/35
-1 < 0
1/(m^1) = 1/35 // * m^1
1 = 1/35*m^1 // : 1/35
35 = m^1
m = 35
m = 35
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