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(X^3)/4-(3*x) = 0
(X^3)/4-3*x = 0
1/4*X^3-3*x = 0 // - 1/4*X^3
-3*x = -(1/4*X^3) // : -3
x = (-(1/4*X^3))/(-3)
x = 1/12*X^3
x = 1/12*X^3
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