exam Maths Puzzle Numerical Ability

log base5 (3x+15)- log base 5 of 3x=1

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I would like a full description on how to solve the equation below and the answer:

n
- ≥ 1
4

*Note*:n - 4 is N on 4,a fraction.

Thank you for your time! How many 13-card hands having exactly 11 diamonds can be dealt?