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((8*x+7*y)^7)/8 = 0
8*x+7*y = 0 // - 7*y
8*x = -(7*y) // : 8
x = (-(7*y))/8
x = (-7*y)/8
x in { (-7*y)/8, (-7*y)/8, (-7*y)/8, (-7*y)/8, (-7*y)/8, (-7*y)/8, (-7*y)/8 }
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