Using only the digits 0-9, but not 3 or 5, solve for each letter:
GRAPE - PLUM = APPLE
You can only use one digit for each letter.
G R A P E 9 4 8 7 2
- P L U M - 7 1 6 0
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= A P P L E = 8 7 7 1 2
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Well now even I have got this solution and many more but they contain the numbers 3 and 5, which are not to be considered........so i believe the above solution is unique.