book Maths Puzzle Numerical Ability

need answer for the expression 8x - 3, x = the fraction 5 over 2?

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book Other Question

3t/2 - 3t/4 = 3/2 coin collection worth $2.90 contains nickels, dimes, and quaters. There are three times as many dimes as there are nickels, and the number of quarters is 2 more than the number of nickels