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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
3/m = 57/76 // - 57/76
3/m-(57/76) = 0
3/m-3/4 = 0
3*m^-1 = 3/4 // : 3
m^-1 = 1/4
-1 < 0
1/(m^1) = 1/4 // * m^1
1 = 1/4*m^1 // : 1/4
4 = m^1
m = 4
m = 4
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