Thank you for using the site. I'll be happy to help you with this problem.
Since multiplication has a higher precedence than either addition or subtraction, you must first perform the "2 x 2" operation, which gives you:
= 2 + 2 - 4
Then, since addition and subtraction have equal precedence, you do those operations going from left to right, which gives:
= 4 - 4
Thus, 2 + 2 - 2 x 2 = 0.
Please feel free to ask if you have any additional questions about this problem.