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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
18/11 = 49.5/m // - 49.5/m
18/11-(49.5/m) = 0
18/11-49.5*m^-1 = 0
-49.5*m^-1 = -18/11 // : -49.5
m^-1 = 0.03305785
-1 < 0
1/(m^1) = 0.03305785 // * m^1
1 = 0.03305785*m^1 // : 0.03305785
30.25000113 = m^1
m = 30.25000113
m = 30.25000113
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