Question
Simplify: x - (x - y) - y - (y - x)
✓
Answer
x - (x - y) - y - (y - x)
⇒ x - x + y - y - y + x
⇒ 2x - x - 2y + y
⇒ x - y
⇒ x - x + y - y - y + x
⇒ 2x - x - 2y + y
⇒ x - y
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