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((8*x)/2)*x^5-(10*x^4) = 0
((8*x)/2)*x^5-10*x^4 = 0
4*x^6-10*x^4 = 0
2*x^4*(2*x^2-5) = 0
2*x^2 = 5 // : 2
x^2 = 5/2
x^2 = 5/2 // ^ 1/2
abs(x) = (5/2)^(1/2)
x = (5/2)^(1/2) or x = -(5/2)^(1/2)
2*x^4 = 0
2*x^4 = 0 // : 2
x^4 = 0
x = 0
x in { (5/2)^(1/2), -(5/2)^(1/2), 0 }
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