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Some algebra and log questions.

(See attached file for full problem description with proper equations)

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? Can you please show me how to solve the following problems without a calculator? thanks
? x^(2/3)=9
? (2/3)^-x= (27/8)
? 27^(4/3)=x
? 2.8=-2.5 ln (x-70/98.6-70)
? 2/3 [(log2(x-2)+log2(x+2)-log2(x-3)]
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