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