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(X^3)/4-((2*x^1)/4) = 0
(X^3)/4+(-1/2)*x = 0
1/4*X^3-1/2*x = 0 // - 1/4*X^3
-1/2*x = -(1/4*X^3) // : -1/2
x = (-(1/4*X^3))/(-1/2)
x = 1/2*X^3
x = 1/2*X^3
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