In the following formula, the same letter represents the same number ABC + ABC = DDD, finding a = b = C = D=

In the following formula, the same letter represents the same number ABC + ABC = DDD, finding a = b = C = D=

A=B=C=1,D=2;
A=B=C=2,D=4;
A=B=C=3,D=6;
A=B=C=4,D=8.