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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
(7/8)/m = 1/7 // - 1/7
(7/8)/m-(1/7) = 0
(7/8)/m-1/7 = 0
7/8*m^-1 = 1/7 // : 7/8
m^-1 = 8/49
-1 < 0
1/(m^1) = 8/49 // * m^1
1 = 8/49*m^1 // : 8/49
49/8 = m^1
m = 49/8
m = 49/8
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