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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)
(6*m^2+8*m)/(2*m+1) = 0
6*m^2+8*m = 0
2*m*(3*m+4) = 0
3*m+4 = 0 // - 4
3*m = -4 // : 3
m = -4/3
2*m*(m+4/3) = 0
(2*m*(m+4/3))/(2*m+1) = 0
( 2*m )
2*m = 0 // : 2
m = 0
( m+4/3 )
m+4/3 = 0 // - 4/3
m = -4/3
m in { 0, -4/3 }
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