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To solve this expression, we first multiply the denominators to find a common denominator, which is 8.
9/4 can be written as (9/4)(2/2) = 18/8.
Now we can rewrite the expression as:
(18/8) + (-3/8)
To add these fractions, we add the numerators and keep the common denominator:
(18 + (-3))/8 = 15/8
Therefore, 9/4 + -3/8 = 15/8.