What will come in place of the x in the following Number…

What will come in place of the x in the following Number series? 6, 12, 21, x , 48

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 #6720

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