exam Maths Puzzle Numerical Ability

Can you please help me with this question.
The problem is 5^x-2=4^x-1. The answer I came up with is log4 but that doesnt seem right can you help? Thanks

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exam Other Question

combine into a single log

2logbx-4logby
Please help me solve this one, I have worked on it for some time and cannot figure it out.

2x/9-5x/4=7/36