1. The problem is to simplify the expression with the addition of 4. 2. Since the original expression is not provided, we assume the problem is to add 4 to a given number or expression. 3. The general formula for addition is $a + b = c$, where $a$ and $b$ are numbers or expressions. 4. If the original expression is $x$, then adding 4 gives $x + 4$. 5. This is the simplified form unless more context is given. 6. If you provide the original expression, I can help simplify further.