In DS, Variable approach is the easiest and quickest way to find the answer without actually solving the problem.
Remember equal number of variables and equations ensures a solution.
=> We can deduce x+a=y or x+a=-y? ==> x=y-a or x=-y-a? from the question, thus the best answer is A
If you know our own innovative logics to find the answer, you don't need to actually solve the problem.
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