7+7:4

To solve the expression \(7 + 7:4\), we first need to clarify the operation represented by ":", which typically indicates division. Thus, we can rewrite the expression as:

\[7 + \frac{7}{4}\]

Next, we calculate \(\frac{7}{4}\):

\[\frac{7}{4} = 1.75\]

Now, we can add that to 7:

\[7 + 1.75 = 8.75\]

So, the final answer is:

\[\boxed{8.75}\]