(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

given a number of four ciphers ABCD and another four cipher number CDAB get the values of A,B,C,D if we know that 2x (ABCD)=CDAB-5

2. Relevant equations

2X (ABCD)=CDAB-5

3. The attempt at a solution

no idea.. i have try by brute force but got no results only incongruences , for example B=-3 or similar here '2 x' means multiplication

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# Homework Help: A logic problem of numbers

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