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D( m )
m+9 = 0
m+9 = 0
m+9 = 0
m+9 = 0 // - 9
m = -9
m in (-oo:-9) U (-9:+oo)
(7*m+60*m-27)/(m+9) = 0
(67*m-27)/(m+9) = 0
67*m-27 = 0 // + 27
67*m = 27 // : 67
m = 27/67
m = 27/67
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