book Maths Puzzle Numerical Ability

3t/2 - 3t/4 = 3/2

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book Other Question

Pre-Alegebra. Multiply. Write each product in lowest terms.

7
--- X 15 =
10

I am having a hard time with this one. Could you please answer this problem and explain it to me? I would appreciate it.. Thanks need answer for the expression 8x - 3, x = the fraction 5 over 2?