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x in (-oo:+oo)
(282-((9*x^4)/4))/7 = 0
((-9/4)*x^4+282)/7 = 0
(282-9/4*x^4)/7 = 0
-9/4*x^4 = -282 // : -9/4
x^4 = 376/3
x^4 = 376/3 // ^ 1/4
abs(x) = (376/3)^(1/4)
x = (376/3)^(1/4) or x = -(376/3)^(1/4)
x in { (376/3)^(1/4), -(376/3)^(1/4) }
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