Condense each expression: 9. 3log₂x + 4log₂ (x - 16) Solve for x: 11. log,81 + x = 2log,729 10. log54 + logx - 5log(x - 1) 3 12. log₂ (x + 4) + log₂ (x - 4) = log₂20

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