>>718643369
>>718643217
It's undefined. Here's an attempt at an intuitive 4 year old explanation.
The way it's phrased (i.e. the order you put the signs in) you probably want it to be "infinity", because you're probably thinking of it as "2 - 2 + 2", which is obviously 2. But, let's accept that infinity plus infinity is still infinity - which seems pretty clear, even to a 4 year old. Now try rearranging it to "(infinity plus infinity) minus infinity" which gives "infinity minus infinity" - and now you probably feel like it should be zero.
The fact that you can arbitrarily rearrange the equation to feel like different answers are appropriate should help you understand why the answer is actually undefined.