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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
7/m = 35/88 // - 35/88
7/m-(35/88) = 0
7/m-35/88 = 0
7*m^-1 = 35/88 // : 7
m^-1 = 5/88
-1 < 0
1/(m^1) = 5/88 // * m^1
1 = 5/88*m^1 // : 5/88
88/5 = m^1
m = 88/5
m = 88/5
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