30 - ((4ц 3/4 - 2ц 1/2) : 1/8 + 5ц 3/7)

First, we need to simplify the expressions within the parentheses:

4ц 3/4 - 2ц 1/2 = (4 + 3/4)ц - (2 + 1/2)ц
= (16/4 + 3/4)ц - (4/2 + 1/2)ц
= 19/4ц - 5/2ц
= (192 - 54)/4ц
= (38 - 20)/4ц
= 18/4ц
= 4ц 1/2

Now substitute back into the original equation:

30 - (4ц 1/2 : 1/8 + 5ц 3/7)
= 30 - (4ц 1/2 * 8 + 5ц 3/7)
= 30 - (33ц 5/7)
= 30 - 33ц 5/7

Therefore, the simplified expression is:
30 - 33ц 5/7