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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
45/77.5 = 10/m // - 10/m
45/77.5-(10/m) = 0
45/77.5-10*m^-1 = 0
-10*m^-1 = -0.58064516 // : -10
m^-1 = 0.05806452
-1 < 0
1/(m^1) = 0.05806452 // * m^1
1 = 0.05806452*m^1 // : 0.05806452
17.22222107 = m^1
m = 17.22222107
m = 17.22222107
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