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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
-42/6 = 14/n // - 14/n
-(14/n)-42/6 = 0
-14*n^-1-42/6 = 0
-14*n^-1 = 7 // : -14
n^-1 = -1/2
-1 < 0
1/(n^1) = -1/2 // * n^1
1 = -1/2*n^1 // : -1/2
-2 = n^1
n = -2
n = -2
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