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u^5*y*((12*y^4)/20)-(4*x^2*y^3) = 0
u^5*y*((12*y^4)/20)-4*x^2*y^3 = 0
-4*x^2*y^3 = -(3/5*u^5*y^5) // : -4*y^3
x^2 = 3/20*u^5*y^2
x^2 = 3/20*u^5*y^2 // ^ 1/2
abs(x) = (3/20)^(1/2)*u^(5/2)*y
x = (3/20)^(1/2)*u^(5/2)*y or x = -((3/20)^(1/2)*u^(5/2)*y)
x in { (3/20)^(1/2)*u^(5/2)*y, -((3/20)^(1/2)*u^(5/2)*y) }
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