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u^3*((12*u^4*v^6)/3)-(12*u^2*x^4) = 0
u^3*((12*u^4*v^6)/3)-12*u^2*x^4 = 0
-12*u^2*x^4 = -(4*u^7*v^6) // : -12*u^2
x^4 = (1/3)*u^5*v^6
x^4 = 1/3*u^5*v^6 // ^ 1/4
abs(x) = (1/3)^(1/4)*u^(5/4)*v^(3/2)
x = (1/3)^(1/4)*u^(5/4)*v^(3/2) or x = -((1/3)^(1/4)*u^(5/4)*v^(3/2))
x in { (1/3)^(1/4)*u^(5/4)*v^(3/2), -((1/3)^(1/4)*u^(5/4)*v^(3/2)) }
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