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