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((8*w^4*x^5)/8)*x^2-(4*u^2*x^3) = 0
((8*w^4*x^5)/8)*x^2-4*u^2*x^3 = 0
w^4*x^7-4*u^2*x^3 = 0
x^3*(w^4*x^4-4*u^2) = 0
w^4*x^4 = -(-4*u^2) // : w^4
x^4 = (4*u^2)/(w^4)
x^4 = (4*u^2)/(w^4) // ^ 1/4
abs(x) = (4^(1/4)*u^(1/2))/w
x = (4^(1/4)*u^(1/2))/w or x = -((4^(1/4)*u^(1/2))/w)
x^3 = 0
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x in { (4^(1/4)*u^(1/2))/w, -((4^(1/4)*u^(1/2))/w), 0 }
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