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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
17/7 = 51/m // - 51/m
17/7-(51/m) = 0
17/7-51*m^-1 = 0
-51*m^-1 = -17/7 // : -51
m^-1 = 1/21
-1 < 0
1/(m^1) = 1/21 // * m^1
1 = 1/21*m^1 // : 1/21
21 = m^1
m = 21
m = 21
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