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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
34/9 = 170/m // - 170/m
34/9-(170/m) = 0
34/9-170*m^-1 = 0
-170*m^-1 = -34/9 // : -170
m^-1 = 1/45
-1 < 0
1/(m^1) = 1/45 // * m^1
1 = 1/45*m^1 // : 1/45
45 = m^1
m = 45
m = 45
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