1. The problem is to evaluate the expression $67 + 67 \_ 67$. 2. First, we need to clarify the meaning of the underscore symbol "_" in the expression. In standard arithmetic, underscore is not an operator. It might be a typo or intended as multiplication or subtraction. 3. Assuming the underscore represents multiplication (common in some programming contexts), the expression becomes $67 + 67 \times 67$. 4. According to the order of operations (PEMDAS/BODMAS), multiplication is done before addition. 5. Calculate the multiplication part: $$67 \times 67 = 4489$$ 6. Now add the result to 67: $$67 + 4489 = 4556$$ 7. Therefore, the value of the expression is $4556$. If the underscore means something else, please clarify.