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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
-24/6 = 21/n // - 21/n
-(21/n)-24/6 = 0
-21*n^-1-24/6 = 0
-21*n^-1 = 4 // : -21
n^-1 = -4/21
-1 < 0
1/(n^1) = -4/21 // * n^1
1 = -4/21*n^1 // : -4/21
-21/4 = n^1
n = -21/4
n = -21/4
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