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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(4/8)*y-((3*y)/y)+1 = 2 // - 2
(4/8)*y-((3*y)/y)-2+1 = 0
(4/8)*y-3-2+1 = 0
1/2*y-4 = 0 // + 4
1/2*y = 4 // : 1/2
y = 4/1/2
y = 8
y = 8
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