Question: Prove or disprove the conjectures: (a) {x|3y R:x= y 2y} = R. (b) If A, B, C are sets, then (AN B)-C (A-C) N

Prove or disprove the conjectures: (a) {x|3y R:x= y 2y} = R. 

Prove or disprove the conjectures: (a) {x|3y R:x= y 2y} = R. (b) If A, B, C are sets, then (AN B)-C (A-C) N (B-C)

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