7/2:(4-1/3*/2x-1/):21/22

To solve this expression, we need to follow the order of operations (PEMDAS/BODMAS).

First, let's simplify the expression inside the parentheses:
4 - 1/3 * (2x - 1)

Next, let's distribute the multiplication:
4 - (2x - 1)/3

Now, let's simplify the expression inside the parentheses further:
4 - (2x/3 - 1/3)

Next, let's find a common denominator for the subtraction:
4 - (2x/3 - 1/3) = 4 - (2x - 1)/3

Now, let's simplify the expression further:
4 - (2x - 1)/3 = (12 - 2x + 1)/3 = (13 - 2x)/3

Now, let's substitute this simplified expression back into the original expression:
7/2 * (13 - 2x)/3 * 21/22

Next, let's simplify the multiplication:
(7/2 * (13 - 2x) * 21)/(3 * 22)

Now, let's simplify the multiplication further:
(7 * (13 - 2x) * 21)/(2 * 3 * 22)

Now, let's simplify the multiplication even further:
(7 * (13 - 2x) * 7)/(2 * 22)

Now, let's simplify the multiplication one last time:
(7 * (13 - 2x) * 7)/(44)

Finally, let's simplify the expression:
(7 * (13 - 2x) * 7)/(44) = (49 * (13 - 2x))/(44) = (637 - 98x)/(44)

So, the simplified expression is (637 - 98x)/(44).