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u^4*((8*u^2*v^2-(4*v^3*x^4))/16) = 0
u^4*((8*u^2*v^2-4*v^3*x^4)/16) = 0
(u^4*(8*u^2*v^2-4*v^3*x^4))/16 = 0
-4*v^3*x^4 = -(8*u^2*v^2) // : -4*v^3
x^4 = 2*u^2*v^-1
x^4 = 2*u^2*v^-1 // ^ 1/4
abs(x) = 2^(1/4)*u^(1/2)*v^(-1/4)
x = 2^(1/4)*u^(1/2)*v^(-1/4) or x = -(2^(1/4)*u^(1/2)*v^(-1/4))
x in { 2^(1/4)*u^(1/2)*v^(-1/4), -(2^(1/4)*u^(1/2)*v^(-1/4)) }
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