equation for subtract the result in C form the result in A ...

is it C - A

You have it reversed, it should be

A - C

( If I said to you "subtract 3 from 8, would you perform 8-3 or 3-8 ? )

8-3 ... thank u ..

To subtract the result in C from the result in A, you would write the equation as A - C. This means that you are subtracting the value of C from the value of A. The order of subtraction is important, as it determines which result you will get.