Call the digits a,b,c left-to-right
a = c/2
b+c = 7
b-a = 1
we see that c=2a, so
subtract to get
Thus c=4 and b=3
Or, just working with the specs,
c must be even, since it can be divided by 2. So, R is one of the forms
Since the last two add to 7, R must be
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