Complete the series 13, 9, 5, 1, -3,-7

Complete the series 13, 9, 5, 1, -3,-7 ...

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 #51489

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