7+8(5:5)

To solve the expression \( 7 + 8(5:5) \), we first need to clarify that the colon (:) typically denotes division. Therefore, \( 5:5 \) can be interpreted as \( 5 \div 5 = 1 \).

Now, we can substitute back into the expression:

\[ 7 + 8(1) \]

Now, multiply \( 8 \) by \( 1 \):

\[ 7 + 8 = 15 \]

So, the final answer is \( 15 \).