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Answers by John R.

(3/5 + 3/4)-1/2 (answer)

Remember PEMDAS: Parentheses, Exponents, Multiplication and Division (left-to-right), Addition and Subtraction (left-to-right).  First find the LCD of 3/5 and 3/4, which is 20. This becomes 12/20+15/20 = 27/20.  Then, do 27/20 - 1/2, again finding the LCD first, which is 20...