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x in (-oo:+oo)
v = (1/3)*x^8*x^10 // - (1/3)*x^8*x^10
v-((1/3)*x^8*x^10) = 0
v+(-1/3)*x^18 = 0
-1/3*x^18 = -v // : -1/3
x^18 = 3*v
x^18 = 3*v // ^ 1/18
abs(x) = 3^(1/18)*v^(1/18)
x = 3^(1/18)*v^(1/18) or x = -(3^(1/18)*v^(1/18))
x in { 3^(1/18)*v^(1/18), -(3^(1/18)*v^(1/18)) }
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