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16*u^7*x^6-(((7*u^2*x^6)/(-4))*u^3*x^4) = 0
16*u^7*x^6+(7/4)*u^5*x^10 = 0
16*u^7*x^6+7/4*u^5*x^10 = 0
u^5*x^6*(16*u^2+7/4*x^4) = 0
7/4*x^4 = -(16*u^2) // : 7/4
x^4 = -64/7*u^2
x^4 = -64/7*u^2 // ^ 1/4
abs(x) = (-64/7)^(1/4)*u^(1/2)
x = (-64/7)^(1/4)*u^(1/2) or x = -((-64/7)^(1/4)*u^(1/2))
u^5*x^6 = 0
u^5*x^6 = 0 // : u^5
x^6 = 0
x = 0
x in { (-64/7)^(1/4)*u^(1/2), -((-64/7)^(1/4)*u^(1/2)), 0 }
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