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Mathematics, 02.03.2021 23:00 duckydo

7a + 5b-3a + 4b (a +a+a+a+a+a+a) +(b + b + b + b + b)-(a +a+a)+(b+b+b+b) Why are the rows equivalent?

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7a + 5b-3a + 4b (a +a+a+a+a+a+a) +(b + b + b + b + b)-(a +a+a)+(b+b+b+b) Why are the rows equivalent...

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