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MathNet 2026 — Part 07 Question 181

Math Olympiad Vault · MathNet 2026 — Part 07

Question 181

Find all negative solutions to the equation $x = \sqrt[3]{20 + 21 \sqrt[3]{20 + 21 \sqrt[3]{20 + 21 x}}}$
  1. $-1, -2$
  2. $-5, -3$
  3. $-2, -4$
  4. $-4, -1$