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x in (-oo:+oo)
v = (3/8)*x^8*x^12 // - (3/8)*x^8*x^12
v-((3/8)*x^8*x^12) = 0
v+(-3/8)*x^20 = 0
-3/8*x^20 = -v // : -3/8
x^20 = 8/3*v
x^20 = 8/3*v // ^ 1/20
abs(x) = (8/3)^(1/20)*v^(1/20)
x = (8/3)^(1/20)*v^(1/20) or x = -((8/3)^(1/20)*v^(1/20))
x in { (8/3)^(1/20)*v^(1/20), -((8/3)^(1/20)*v^(1/20)) }
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