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Let \( f: R \rightarrow R \) be a function defined by
P \( f(x)=2 x^{3}-21 x^{2}+78 x+24 \). Number of integers in

W the solution set of \( x \) satisfying the inequality \( f\left(f\left(f(x)-2 x^{3}\right)\right) \geq f\left(f\left(2 x^{3}-f(x)\right)\right) \) is :
(1) 3
(2) 4
(3) 5
(4) 6
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