book Maths Puzzle Numerical Ability

How do I do the following problem?

5^x = 6^(x +8)

Thank you for your help

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book Other Question

how do I solve 8x - 4 = 7x My question is really about multi-step equations one is 2m+5=m over 5(in fraction form)-4, another one is m over 2 (in fraction form)+3= m over 2 (in fraction form)+5