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