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D( m )
m+3 = 0
m+3 = 0
m+3 = 0
m+3 = 0 // - 3
m = -3
m in (-oo:-3) U (-3:+oo)
6/(m+3) = 4/11 // - 4/11
6/(m+3)-(4/11) = 0
6/(m+3)-4/11 = 0
(6*11)/(11*(m+3))+(-4*(m+3))/(11*(m+3)) = 0
6*11-4*(m+3) = 0
54-4*m = 0
(54-4*m)/(11*(m+3)) = 0
(54-4*m)/(11*(m+3)) = 0 // * 11*(m+3)
54-4*m = 0
54-4*m = 0 // - 54
-4*m = -54 // : -4
m = -54/(-4)
m = 27/2
m = 27/2
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