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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
1521/m = 9 // - 9
1521/m-9 = 0
1521*m^-1 = 9 // : 1521
m^-1 = 1/169
-1 < 0
1/(m^1) = 1/169 // * m^1
1 = 1/169*m^1 // : 1/169
169 = m^1
m = 169
m = 169
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