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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
18/16 = 63/m // - 63/m
18/16-(63/m) = 0
18/16-63*m^-1 = 0
-63*m^-1 = -9/8 // : -63
m^-1 = 1/56
-1 < 0
1/(m^1) = 1/56 // * m^1
1 = 1/56*m^1 // : 1/56
56 = m^1
m = 56
m = 56
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