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3*v^2-(v^3*((9*v^4*w)/6)*x^3) = 0
3*v^2+(-3/2)*v^7*w*x^3 = 0
-3/2*v^7*w*x^3 = -(3*v^2) // : -3/2*v^7*w
x^3 = 2*v^-5*w^-1
x^3 = 2*v^-5*w^-1 // ^ 1/3
x = 2^(1/3)*v^(-5/3)*w^(-1/3)
x = 2^(1/3)*v^(-5/3)*w^(-1/3)
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