hard · GMAT Quant
A real-valued function f(x) satisfies the identity f(x) + 2f(-x) = 3x^3 - 6x for all real numbers x.
Which of the following expressions represents f(x)?
- -3x^3 + 6x
- 3x^3 - 6x
- -x^3 + 2x
- x^3 - 2x
- -9x^3 + 18x
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