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x in (-oo:+oo)
a = (1/2)*x^8*x^19 // - (1/2)*x^8*x^19
a-((1/2)*x^8*x^19) = 0
a+(-1/2)*x^27 = 0
-1/2*x^27 = -a // : -1/2
x^27 = 2*a
x^27 = 2*a // ^ 1/27
x = 2^(1/27)*a^(1/27)
x = 2^(1/27)*a^(1/27)
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