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x^3*((15*u^6*x^5-(5*x^2*y^2))/10) = 0
x^3*((15*u^6*x^5-5*x^2*y^2)/10) = 0
(x^3*(15*u^6*x^5-5*x^2*y^2))/10 = 0
15*u^6*x^5-5*x^2*y^2 = 0
5*x^2*(3*u^6*x^3-y^2) = 0
3*u^6*x^3 = y^2 // : 3*u^6
x^3 = (y^2)/(3*u^6)
x^3 = (y^2)/(3*u^6) // ^ 1/3
x = (y^(2/3))/(3^(1/3)*u^2)
5*x^2*(x-3^(-1/3)*u^-2*y^(2/3)) = 0
(5*x^2*x^3*(x-3^(-1/3)*u^-2*y^(2/3)))/10 = 0
( 5*x^2 )
5*x^2 = 0 // : 5
x^2 = 0
x = 0
( x-3^(-1/3)*u^-2*y^(2/3) )
x-3^(-1/3)*u^-2*y^(2/3) = 0 // + -3^(-1/3)*u^-2*y^(2/3)
x = -(-3^(-1/3)*u^-2*y^(2/3))
( x^3 )
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x in { 0, -(-3^(-1/3)*u^-2*y^(2/3)), 0 }
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