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D( n )
0.8*n-0.8 = 0
0.8*n-0.8 = 0
0.8*n-0.8 = 0
0.8*n-0.8 = 0 // + 0.8
0.8*n = 0.8 // : 0.8
n = 0.8/0.8
n = 1
n in (-oo:1) U (1:+oo)
(0.16*n)/(0.8*n-0.8) = 0
0.16*n = 0 // : 0.16
n = 0
n = 0
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