The letters A, B, C and D all represent different digits. If \dfrac{+C A}{D A} and \dfrac{-C A}{A}, what digit does D represent?
Answer Choices
A. 5
B. 6
C. 7
D. 8
E. 9
The letters A, B, C and D all represent different digits. If \dfrac{+C A}{D A} and \dfrac{-C A}{A}, what digit does D represent?
Answer Choices
A. 5
B. 6
C. 7
D. 8
E. 9