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D( n )
15-(6*n) = 0
15-(6*n) = 0
15-(6*n) = 0
15-6*n = 0
15-6*n = 0 // - 15
-6*n = -15 // : -6
n = -15/(-6)
n = 5/2
n in (-oo:5/2) U (5/2:+oo)
((15-(6*n))^-1)/2 = 1/9 // - 1/9
((15-(6*n))^-1)/2-(1/9) = 0
((15-6*n)^-1)/2-1/9 = 0
1/(2*(15-6*n))-1/9 = 0
9/(2*9*(15-6*n))+(-1*2*(15-6*n))/(2*9*(15-6*n)) = 0
9-1*2*(15-6*n) = 0
12*n-21 = 0
(12*n-21)/(2*9*(15-6*n)) = 0
(12*n-21)/(2*9*(15-6*n)) = 0 // * 2*9*(15-6*n)
12*n-21 = 0
12*n-21 = 0 // + 21
12*n = 21 // : 12
n = 21/12
n = 7/4
n = 7/4
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