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x in (-oo:+oo)
(5*x^4*y)/4 = 10 // - 10
(5*x^4*y)/4-10 = 0
5/4*x^4*y = 10 // : 5/4*y
x^4 = 8*y^-1
x^4 = 8*y^-1 // ^ 1/4
abs(x) = 8^(1/4)*y^(-1/4)
x = 8^(1/4)*y^(-1/4) or x = -(8^(1/4)*y^(-1/4))
x in { 8^(1/4)*y^(-1/4), -(8^(1/4)*y^(-1/4)) }
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