4:2+5-4

To solve the expression \( 4:2 + 5 - 4 \), we first need to interpret the notation correctly. Here, \( 4:2 \) typically denotes division, so it can be rewritten as:

\[ \frac{4}{2} + 5 - 4 \]

Now, we can perform the calculations step by step:

1. Calculate \( \frac{4}{2} \): \[ \frac{4}{2} = 2 \]

2. Substitute that back into the expression: \[ 2 + 5 - 4 \]

3. Now, add \( 2 + 5 \): \[ 2 + 5 = 7 \]

4. Finally, subtract \( 4 \): \[ 7 - 4 = 3 \]

The final result is \( 3 \).