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x in (-oo:+oo)
y = (1/8)*x^9 // - (1/8)*x^9
y-((1/8)*x^9) = 0
(-1/8)*x^9+y = 0
-1/8*x^9 = -y // : -1/8
x^9 = 8*y
x^9 = 8*y // ^ 1/9
x = 8^(1/9)*y^(1/9)
x = 8^(1/9)*y^(1/9)
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