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25*x^4-((1/4)*y^2) = 0
25*x^4+(-1/4)*y^2 = 0
25*x^4 = -(-1/4*y^2) // : 25
x^4 = 1/100*y^2
x^4 = 1/100*y^2 // ^ 1/4
abs(x) = (1/100)^(1/4)*y^(1/2)
x = (1/100)^(1/4)*y^(1/2) or x = -((1/100)^(1/4)*y^(1/2))
x in { (1/100)^(1/4)*y^(1/2), -((1/100)^(1/4)*y^(1/2)) }
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