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((4*v^2*x^2)/4)*v^2*w^4-(12*v) = 0
((4*v^2*x^2)/4)*v^2*w^4-12*v = 0
v^4*w^4*x^2 = -(-12*v) // : v^4*w^4
x^2 = 12*v^-3*w^-4
x^2 = 12*v^-3*w^-4 // ^ 1/2
abs(x) = 2*3^(1/2)*v^(-3/2)*w^-2
x = 2*3^(1/2)*v^(-3/2)*w^-2 or x = -(2*3^(1/2)*v^(-3/2)*w^-2)
x in { 2*3^(1/2)*v^(-3/2)*w^-2, -(2*3^(1/2)*v^(-3/2)*w^-2) }
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