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18/9-(2*x^3)+5 = 0
18/9-2*x^3+5 = 0
-2*x^3 = -7 // : -2
x^3 = 7/2
x^3 = 7/2 // ^ 1/3
x = (7/2)^(1/3)
x = (7/2)^(1/3)
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