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Problem 9: Prove or disprove: (a) x+y=x+y for all real numbers x,y (b) 2x=x+x+21, for every real number x Problem 9: Prove or disprove: =

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Problem 9: Prove or disprove: (a) x+y=x+y for all real numbers x,y (b) 2x=x+x+21, for every real number x

Problem 9: Prove or disprove: = L:r] -h ly] for all real numbers x, y I x] -F + BJ, for every real number x. (b) L2x]

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