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v^3*((4^4*v^4)/6)-(8*v^4*x^5) = 0
v^3*((4^4*v^4)/6)-8*v^4*x^5 = 0
-8*v^4*x^5 = -(128/3*v^7) // : -8*v^4
x^5 = 16/3*v^3
x^5 = 16/3*v^3 // ^ 1/5
x = (16/3)^(1/5)*v^(3/5)
x = (16/3)^(1/5)*v^(3/5)
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