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20. If x=2a+3b and y = 20-3b, find (x+y)(x-y).

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20. If x=2a+3b and y = 20-3b, find (x+y)(x-y)....

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20. If x=2a+3b and y = 20-3b, find (x+y)(x-y).​

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20. If x=2a+3b and y = 20-3b, find (x+y)(x-y).