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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
14/6-(21/m) = 0
14/6-21*m^-1 = 0
-21*m^-1 = -7/3 // : -21
m^-1 = 1/9
-1 < 0
1/(m^1) = 1/9 // * m^1
1 = 1/9*m^1 // : 1/9
9 = m^1
m = 9
m = 9
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