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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
(3*15)/n = 45/12 // - 45/12
(3*15)/n-(45/12) = 0
(3*15)/n-15/4 = 0
45*n^-1 = 15/4 // : 45
n^-1 = 1/12
-1 < 0
1/(n^1) = 1/12 // * n^1
1 = 1/12*n^1 // : 1/12
12 = n^1
n = 12
n = 12
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