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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
3 = -24/n-15 // + -24/n-15
3-(-24/n)+15 = 0
24*n^-1+3+15 = 0
24*n^-1 = -18 // : 24
n^-1 = -3/4
-1 < 0
1/(n^1) = -3/4 // * n^1
1 = -3/4*n^1 // : -3/4
-4/3 = n^1
n = -4/3
n = -4/3
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