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x in (-oo:+oo)
((40*x^5)/20)*x^5-16*x^4 = 0
2*x^10-16*x^4 = 0
2*x^4*(x^6-8) = 0
1*x^6 = 8 // : 1
x^6 = 8
x^6 = 8 // ^ 1/6
abs(x) = 8^(1/6)
x = 8^(1/6) or x = -8^(1/6)
2*x^4 = 0
2*x^4 = 0 // : 2
x^4 = 0
x = 0
x in { 8^(1/6), -8^(1/6), 0 }
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