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.
-2 - 9 + (-7) = -2 - 9 - 7 = -11 - 7 = = -18 the answer to this is (-18)
7/9 x 18 = 147/9 of 18 is 14.
9*2 = 18
34 - 7 - 9 = 34 - 16 = 18 3(7 - 4) + 9 = 9 + 9 = 18 (7 - 4) x (9 - 3) = 3 x 6 = 18
5/6 - 4/9 = 15/18 - 8/18 = 7/185/6 - 4/9 = 15/18 - 8/18 = 7/185/6 - 4/9 = 15/18 - 8/18 = 7/185/6 - 4/9 = 15/18 - 8/18 = 7/18
5/9 = 10/18 so, 5/9 > 7/18 ========
7/9 of 18 is 14.
-7/9 - 5/10 = -7/9 - 1/2 = -14/18 - 9/18 = -23/18
9/7
18/7 * 9/12 = 18/7 * 3/4 = (18*3)/(7/4) = 54/28 = 27/14
Least Common Multiple (LCM) for 9 7 18 is 126
7/18 divided by 5/9 = 7/10 or 0.7