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12*x^5-(((9*v^4)/3)*x^2) = 0
12*x^5-3*v^4*x^2 = 0
12*x^5-3*v^4*x^2 = 0
3*x^2*(4*x^3-v^4) = 0
4*x^3 = v^4 // : 4
x^3 = (v^4)/4
x^3 = (v^4)/4 // ^ 1/3
x = (v^(4/3))/(4^(1/3))
3*x^2 = 0
3*x^2 = 0 // : 3
x^2 = 0
x = 0
x in { (v^(4/3))/(4^(1/3)), 0 }
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