4.72
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To subtract in Roman numerals, you simply place a smaller number in front of a larger one. You subtract the value of the smaller number from the larger one. For example, to express 4 in Roman numerals, you write IV (5-1). Similarly, to express 9, you write IX (10-1).
-3
-6 or subtract by 6 o.o
x - (y + 2)
When you subtract 16 2/3 from 7 7/8 you will get 211/24 as a mixed number.