Complete the series 1,-3, -7, -11, -15, -19

Complete the series 1,-3, -7, -11, -15, -19... ...

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 #79478

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