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- $ \\\log _2^2x - {\\\log _2}x - 6 = 0$.
- $ \\\log _2^2x - {\\\log _2}x = 0$.
- $ \\\log _2^2x - {\\\log _2}x + 6 = 0$
- $ \\\log _2^2x + {\\\log _2}x = 0$.