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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
252/12 = 378/n // - 378/n
252/12-(378/n) = 0
252/12-378*n^-1 = 0
-378*n^-1 = -21 // : -378
n^-1 = 1/18
-1 < 0
1/(n^1) = 1/18 // * n^1
1 = 1/18*n^1 // : 1/18
18 = n^1
n = 18
n = 18
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