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3-((5/4)*x^6) = 0
(-5/4)*x^6+3 = 0
-5/4*x^6 = -3 // : -5/4
x^6 = 12/5
x^6 = 12/5 // ^ 1/6
abs(x) = (12/5)^(1/6)
x = (12/5)^(1/6) or x = -(12/5)^(1/6)
x in { (12/5)^(1/6), -(12/5)^(1/6) }
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