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x in (-oo:+oo)
x*(((4/5)*x^5)/4)-3 = 0
1/5*x^6 = 3 // : 1/5
x^6 = 15
x^6 = 15 // ^ 1/6
abs(x) = 15^(1/6)
x = 15^(1/6) or x = -15^(1/6)
x in { 15^(1/6), -15^(1/6) }
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