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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
0.4/1.5 = 12/n // - 12/n
0.4/1.5-(12/n) = 0
0.4/1.5-12*n^-1 = 0
-12*n^-1 = -0.26666667 // : -12
n^-1 = 0.02222222
-1 < 0
1/(n^1) = 0.02222222 // * n^1
1 = 0.02222222*n^1 // : 0.02222222
45.0000045 = n^1
n = 45.0000045
n = 45.0000045
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