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pkasanova17p14jc2

1) a²-b²+b²=a²

2)4a²-b²-4a²=-b²

3)ab-a²+b²-ab+a²+ab-b²=ab

4)9x²-y²+y²=9x²

5)3xy-9x²+y²-3xy+9x²=y²

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