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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
9 = 1404/m // - 1404/m
9-(1404/m) = 0
9-1404*m^-1 = 0
-1404*m^-1 = -9 // : -1404
m^-1 = 1/156
-1 < 0
1/(m^1) = 1/156 // * m^1
1 = 1/156*m^1 // : 1/156
156 = m^1
m = 156
m = 156
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