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3) Prove or disprove the following statements: a) Whenever x and y are real numbers: x+yx+y=0or1 b) For all real numbers x : 2x=2x+1 20

3) Prove or disprove the following statements: a) Whenever x and y are real numbers: x+yx+y=0or1 b) For all real numbers x : 2x=2x+1 20 points ( 10 each)

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