book Maths Puzzle Numerical Ability

Sets, Inequalities, and Interval Notation

2/3(7/8-4x)- 5/8<3/8
My first approach to this problem is to multiply the entire equation by 24/1 and I did but I am confused about th

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I do not understand how to do any of this. can u try and teach me or at least show me? In North Dakota, most license plates consist of five lettes. How many different license plates are there if the letters can be repeated?