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D( m )
2*m+1 = 0
2*m+1 = 0
2*m+1 = 0
2*m+1 = 0 // - 1
2*m = -1 // : 2
m = -1/2
m in (-oo:-1/2) U (-1/2:+oo)
(4*m^2+2*m+7)/(2*m+1) = 0
4*m^2+2*m+7 = 0
4*m^2+2*m+7 = 0
DELTA = 2^2-(4*4*7)
DELTA = -108
DELTA < 0
1 = 0
1/(2*m+1) = 0
m belongs to the empty set
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