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3. Prove that F = {a + fix/5 : (L,b E Z} is a ring (with the usual operations of addition and multiplication from R)

3. Prove that F = {a + fix/5 : (L,b E Z} is a ring (with the usual operations of addition and multiplication from R) and decide whether the elements 9 4J3 and 7+3x/3 are units in F

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