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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
(6-n)/n > 11 // - 11
(6-n)/n-11 > 0
(6-n)/n+(-11*n)/n > 0
6-n-11*n > 0
6-12*n > 0
(6-12*n)/n > 0
(6-12*n)/n > 0 // * n^2
n*(6-12*n) > 0
( 6-12*n )
6-12*n > 0 // - 6
-12*n > -6 // : -12
n < -6/(-12)
n < 1/2
( n )
n+0 > 0 // - 0
n > 0
(-oo:0) (0:1/2) (1/2:+oo) 6-12*n + + - n - + +
n in (0:1/2)
(0:1/2)
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