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x in (-oo:+oo)
x*((-4*x^4)/5) = -6 // + 6
x*((-4*x^4)/5)+6 = 0
-4/5*x^5 = -6 // : -4/5
x^5 = 15/2
x^5 = 15/2 // ^ 1/5
x = (15/2)^(1/5)
x = (15/2)^(1/5)
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