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y in (-oo:+oo)
(1/2)*y-2 = (1/8)*y // - (1/8)*y
(1/2)*y-((1/8)*y)-2 = 0
(1/2)*y+(-1/8)*y-2 = 0
3/8*y-2 = 0 // + 2
3/8*y = 2 // : 3/8
y = 2/3/8
y = 16/3
y = 16/3
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