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X^3-((8/3)*x) = 0
X^3+(-8/3)*x = 0
X^3-8/3*x = 0 // - X^3
-8/3*x = -X^3 // : -8/3
x = (-X^3)/(-8/3)
x = 3/8*X^3
x = 3/8*X^3
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