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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
48/m = 4/7 // - 4/7
48/m-(4/7) = 0
48/m-4/7 = 0
48*m^-1 = 4/7 // : 48
m^-1 = 1/84
-1 < 0
1/(m^1) = 1/84 // * m^1
1 = 1/84*m^1 // : 1/84
84 = m^1
m = 84
m = 84
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