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D( m )
2*m+1 = 0
m-9 = 0
2*m+1 = 0
2*m+1 = 0
2*m+1 = 0 // - 1
2*m = -1 // : 2
m = -1/2
m-9 = 0
m-9 = 0
m-9 = 0 // + 9
m = 9
m in (-oo:-1/2) U (-1/2:9) U (9:+oo)
5/(m-9) = -6/(2*m+1) // + -6/(2*m+1)
5/(m-9)-(-6/(2*m+1)) = 0
5/(m-9)+6*(2*m+1)^-1 = 0
5/(m-9)+6/(2*m+1) = 0
(5*(2*m+1))/((m-9)*(2*m+1))+(6*(m-9))/((m-9)*(2*m+1)) = 0
5*(2*m+1)+6*(m-9) = 0
16*m-49 = 0
(16*m-49)/((m-9)*(2*m+1)) = 0
(16*m-49)/((m-9)*(2*m+1)) = 0 // * (m-9)*(2*m+1)
16*m-49 = 0
16*m-49 = 0 // + 49
16*m = 49 // : 16
m = 49/16
m = 49/16
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