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D( m )
2*m+5 = 0
2*m+5 = 0
2*m+5 = 0
2*m+5 = 0 // - 5
2*m = -5 // : 2
m = -5/2
m in (-oo:-5/2) U (-5/2:+oo)
(((m-2)*(2*m+3)-((m-1)*(2*m+5)))/(2*m+5))*(m-2) = 0
((m-2)*((m-2)*(2*m+3)-1*(m-1)*(2*m+5)))/(2*m+5) = 0
(m-2)*(2*m+3)-1*(m-1)*(2*m+5) = 0
(m-2)*(2*m+3)-1*(m-1)*(2*m+5) = 0
-4*m-1 = 0
-4*m-1 = 0
((m-2)*(-4*m-1))/(2*m+5) = 0
( -4*m-1 )
-4*m-1 = 0 // + 1
-4*m = 1 // : -4
m = 1/(-4)
m = -1/4
( m-2 )
m-2 = 0 // + 2
m = 2
m in { -1/4, 2 }
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