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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
3/75 = 2/m // - 2/m
3/75-(2/m) = 0
3/75-2*m^-1 = 0
-2*m^-1 = -1/25 // : -2
m^-1 = 1/50
-1 < 0
1/(m^1) = 1/50 // * m^1
1 = 1/50*m^1 // : 1/50
50 = m^1
m = 50
m = 50
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