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52-((32/4)*x^4) = 0
52-8*x^4 = 0
-8*x^4 = -52 // : -8
x^4 = 13/2
x^4 = 13/2 // ^ 1/4
abs(x) = (13/2)^(1/4)
x = (13/2)^(1/4) or x = -(13/2)^(1/4)
x in { (13/2)^(1/4), -(13/2)^(1/4) }
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