If (5 - x)/(7 + x) = x, what is the value…

If (5 - x)/(7 + x) = x, what is the value of x^2 + 8x - 5?

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 #72869

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