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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
22/20 = 77/m // - 77/m
22/20-(77/m) = 0
22/20-77*m^-1 = 0
-77*m^-1 = -11/10 // : -77
m^-1 = 1/70
-1 < 0
1/(m^1) = 1/70 // * m^1
1 = 1/70*m^1 // : 1/70
70 = m^1
m = 70
m = 70
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