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y in (-oo:+oo)
(2-(1/2))^4*y = 1/8 // - 1/8
(2-(1/2))^4*y-(1/8) = 0
(2-1/2)^4*y-1/8 = 0
81/16*y-1/8 = 0 // + 1/8
81/16*y = 1/8 // : 81/16
y = 1/8/81/16
y = 2/81
y = 2/81
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