There's no declared obvious answer, because a placement of parentheses is necessary to make a solid answer. Without the pre-determined parentheses, we can only assume they're either around the 2*0, or around all the 2s. We can't say for sure.
But given the parentheses were around the 2*0, the answer is: 26
Given the parentheses were around the 2s, the answer is: 0
However, if we want to assume there are purposely no parentheses there, the order of operations (PEMDAS) would lead us to multiply the 2 and 0 first, then do the addition and subtraction operations, thus giving us the answer: 26.