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⁴log x³ - ⁴log 1/x = ⁴log x²
⁴log x³/(1/x) = ⁴log x²
⁴log x⁴ = ⁴log x²
⁴log x⁴ - ⁴log x² = 0
⁴log x² = 0 = ⁴log 1
x² = 1 --> x = 1