770-(345-284)=

To solve the expression \( 770 - (345 - 284) \), we first calculate the value inside the parentheses:

\[ 345 - 284 = 61 \]

Now, we subtract this result from 770:

\[ 770 - 61 = 709 \]

So, the final answer is:

\[ \boxed{709} \]