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Do it by inspection. 3^m must be greater than 65, thus m must be 4 or greater (but not much). So, try 4. 3^4 = 81. 2^4 = 16. 81-16 = 65. We're done. Move on to the next problem.
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Do it by inspection. 3^m must be greater than 65, thus m must be 4 or greater (but not much). So, try 4. 3^4 = 81. 2^4 = 16. 81-16 = 65. We're done. Move on to the next problem.
4