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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)
((2*m^2-(2*m^2)+3*m-(4*m)-(5*m)+2*m-6+5)/(2*m+5))*(m-2) = 0
((2*m^2-2*m^2+3*m-4*m-5*m+2*m-6+5)/(2*m+5))*(m-2) = 0
((-4*m-1)*(m-2))/(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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