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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
19/2 = 76/m // - 76/m
19/2-(76/m) = 0
19/2-76*m^-1 = 0
-76*m^-1 = -19/2 // : -76
m^-1 = 1/8
-1 < 0
1/(m^1) = 1/8 // * m^1
1 = 1/8*m^1 // : 1/8
8 = m^1
m = 8
m = 8
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