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v^5*x^3*((12*x^5)/12)+15*w^3*x^5 = 0
v^5*x^8+15*w^3*x^5 = 0
x^5*(v^5*x^3+15*w^3) = 0
v^5*x^3 = -(15*w^3) // : v^5
x^3 = (-15*w^3)/(v^5)
x^3 = (-15*w^3)/(v^5) // ^ 1/3
x = (-15^(1/3)*w)/(v^(5/3))
x^5 = 0
1*x^5 = 0 // : 1
x^5 = 0
x = 0
x in { (-15^(1/3)*w)/(v^(5/3)), 0 }
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