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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
672/m = 24 // - 24
672/m-24 = 0
672*m^-1 = 24 // : 672
m^-1 = 1/28
-1 < 0
1/(m^1) = 1/28 // * m^1
1 = 1/28*m^1 // : 1/28
28 = m^1
m = 28
m = 28
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