The LCD (Lowest Common Denominator) of 7 and 9 is 63.
LCD(7, 9, 2) = 126.
63
63
It is: 364
63
If that's 5/12, 10/13 and 7/9, the LCD is 468.
126
315
126
It is: 63
If you meant LCD, the answer is LCD(9, 7, 18) = 126 But if you did mean LDC, then apologies. I have no idea what that LDC is in a mathematical context.