It is still a subtraction problem.
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rename 8/1 as a whole number
first add the whole numbers then do simple fraction subtraction
28 __ 4 rename as a mixed number or a whole number
Yes, you can but you need to "rename" the whole part of the first mixed number.
Find the sum of two mixed numbers by applying the procedure for adding mixed numbers, Solve a real-world problem by subtracting mixed numbers.