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D( n )
(3/4)*n = 0
(3/4)*n = 0
(3/4)*n = 0
3/4*n = 0 // : 3/4
n = 0
n in (-oo:0) U (0:+oo)
12/((3/4)*n) = 16/10 // - 16/10
12/((3/4)*n)-(16/10) = 0
12/((3/4)*n)-8/5 = 0
16*n^-1 = 8/5 // : 16
n^-1 = 1/10
-1 < 0
1/(n^1) = 1/10 // * n^1
1 = 1/10*n^1 // : 1/10
10 = n^1
n = 10
n = 10
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