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((5*a)/5)*a+5*a*x^10+10/a = 0
5*a*x^10 = -(a^2+10*a^-1) // : 5*a
x^10 = (-1/5)*a^-1*(a^2+10*a^-1)
x^10 = -1/5*a^-1*(a^2+10*a^-1) // ^ 1/10
abs(x) = (-1/5)^(1/10)*a^(-1/10)*(a^2+10*a^-1)^(1/10)
x = (-1/5)^(1/10)*a^(-1/10)*(a^2+10*a^-1)^(1/10) or x = -((-1/5)^(1/10)*a^(-1/10)*(a^2+10*a^-1)^(1/10))
x in { (-1/5)^(1/10)*a^(-1/10)*(a^2+10*a^-1)^(1/10), -((-1/5)^(1/10)*a^(-1/10)*(a^2+10*a^-1)^(1/10)) }
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