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