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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
8/2.2 = 6/m // - 6/m
8/2.2-(6/m) = 0
8/2.2-6*m^-1 = 0
-6*m^-1 = -3.63636364 // : -6
m^-1 = 0.60606061
-1 < 0
1/(m^1) = 0.60606061 // * m^1
1 = 0.60606061*m^1 // : 0.60606061
1.64999999 = m^1
m = 1.64999999
m = 1.64999999
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