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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
1/(-6) = -14/m // + -14/m
1/(-6)-(-14/m) = 0
14*m^-1+1/(-6) = 0
14*m^-1 = 1/6 // : 14
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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