If f(a)=3a+6, what is the value of (f(2a)+f(a))?

If f(a)=3a+6, what is the value of (f(2a)+f(a)) ?

This problem repeats another one in the library (at most with different numbers), so it's left out of browsing.

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #2943

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