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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
95/20 = 162/m // - 162/m
95/20-(162/m) = 0
95/20-162*m^-1 = 0
-162*m^-1 = -19/4 // : -162
m^-1 = 19/648
-1 < 0
1/(m^1) = 19/648 // * m^1
1 = 19/648*m^1 // : 19/648
648/19 = m^1
m = 648/19
m = 648/19
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