Answer: 7
Explanation:
Remember PEMDAS. Parentheses, exponents, multiplication & division (left to right), addition & subtraction (left to right). Also remember to switch the sign when working with negative numbers [ex. 2 - (-2) switches to 2 + 2, 2 + (-2) switches to 2 - 2), etc]
So:
9 + (-4) - (-2) - (7 × 0)
9 - 4 + 2 - 0
5 + 2
7