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217-((2/3)*x^60) = 0
(-2/3)*x^60+217 = 0
-2/3*x^60 = -217 // : -2/3
x^60 = 651/2
x^60 = 651/2 // ^ 1/60
abs(x) = (651/2)^(1/60)
x = (651/2)^(1/60) or x = -(651/2)^(1/60)
x in { (651/2)^(1/60), -(651/2)^(1/60) }
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