To simplify the expression 2/1 + 5/4 - 2/1 + 5/4, we need to find a common denominator for all four fractions before adding or subtracting them.
The common denominator for 2/1 and 2/1 is 1, since both fractions already have the same denominator.
The common denominator for 5/4 and 5/4 is 4, since both fractions already have the same denominator.
Therefore, the simplified expression is:
2/1 + 5/4 - 2/1 + 5/4
= (2 + 5)/1 + (5 + 5)/4
= 7/1 + 10/4
= 7 + 10/4
= (7*4 + 10)/4
= (28 + 10)/4
= 38/4
= 19/2
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