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D( m )
m*(3-m)^14 = 0
m*(3-m)^14 = 0
m*(3-m)^14 = 0
( 3-m )
3-m = 0 // - 3
-m = -3 // * -1
m = 3
( m )
m = 0
m in (-oo:0) U (0:3) U (3:+oo)
(m^2*(9-m)^7)/(m*(3-m)^14) = 0
( 9-m )
9-m = 0 // - 9
-m = -9 // * -1
m = 9
( m^2 )
1*m^2 = 0 // : 1
m^2 = 0
m = 0
m in { 0}
m in { 9, 9, 9, 9, 9, 9, 9 }
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