Turn the numbers inside out to make a magic square

Starting the solving process on the top line, we see that two central numbers summing to 101 will be needed. This gives us a choice of 25-76, 26-75 or 37-64...

Starting the solving process on the top line, we see that two central numbers summing to 101 will be needed. This gives us a choice of 25-76, 26-75 or 37-64 from the list of possibilities. If we examine the 23-45 long diagonal, we see that only 76-98 will fit the bill for the empty cells. Proceeding carefully in this way, the required diagram is discovered, and it reverses as shown here:

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