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D( m )
m-5 = 0
m-5 = 0
m-5 = 0
m-5 = 0 // + 5
m = 5
m in (-oo:5) U (5:+oo)
9/(m-5) < 3 // - 3
9/(m-5)-3 < 0
9/(m-5)+(-3*(m-5))/(m-5) < 0
9-3*(m-5) < 0
24-3*m < 0
(24-3*m)/(m-5) < 0
(24-3*m)/(m-5) < 0 // * (m-5)^2
(24-3*m)*(m-5) < 0
( 24-3*m )
24-3*m < 0 // - 24
-3*m < -24 // : -3
m > -24/(-3)
m > 8
( m-5 )
m-5 < 0 // + 5
m < 5
(-oo:5) (5:8) (8:+oo) 24-3*m + + - m-5 - + +
m in (-oo:5) U (8:+oo)
(-oo:5) U (8:+oo)
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