2x-[3y-{2x-(y-x)}]=?
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2x - [3y - {2x - (y - x)}]
2x - [3y - {2x - y + x}]
2x - [3y - {3x - y}]
2x - [3y - 3x + y]
2x - [4y - 3x]
2x - 4y + 3x
5x - 4y
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