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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
8/2.2 = 6/n // - 6/n
8/2.2-(6/n) = 0
8/2.2-6*n^-1 = 0
-6*n^-1 = -3.63636364 // : -6
n^-1 = 0.60606061
-1 < 0
1/(n^1) = 0.60606061 // * n^1
1 = 0.60606061*n^1 // : 0.60606061
1.64999999 = n^1
n = 1.64999999
n = 1.64999999
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