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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
7/8 = 6/m // - 6/m
7/8-(6/m) = 0
7/8-6*m^-1 = 0
-6*m^-1 = -7/8 // : -6
m^-1 = 7/48
-1 < 0
1/(m^1) = 7/48 // * m^1
1 = 7/48*m^1 // : 7/48
48/7 = m^1
m = 48/7
m = 48/7
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