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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
2/2.7 = 9/m // - 9/m
2/2.7-(9/m) = 0
2/2.7-9*m^-1 = 0
-9*m^-1 = -0.74074074 // : -9
m^-1 = 0.08230453
-1 < 0
1/(m^1) = 0.08230453 // * m^1
1 = 0.08230453*m^1 // : 0.08230453
12.14999952 = m^1
m = 12.14999952
m = 12.14999952
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