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x in (-oo:+oo)
y = (4/11)*x^15 // - (4/11)*x^15
y-((4/11)*x^15) = 0
(-4/11)*x^15+y = 0
-4/11*x^15 = -y // : -4/11
x^15 = 11/4*y
x^15 = 11/4*y // ^ 1/15
x = (11/4)^(1/15)*y^(1/15)
x = (11/4)^(1/15)*y^(1/15)
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