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y in (-oo:+oo)
(((8/5)^5)/8)*y = (8/5)^7 // - (8/5)^7
(((8/5)^5)/8)*y-(8/5)^7 = 0
4096/3125*y-2097152/78125 = 0 // + 2097152/78125
4096/3125*y = 2097152/78125 // : 4096/3125
y = 2097152/78125/4096/3125
y = 512/25
y = 512/25
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