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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
(-2/2)^4*y-1/8 = 0
y-1/8 = 0 // + 1/8
y = 1/8
y = 1/8
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