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1/5 + 1/7 = 12/35.

TO solve, find the least common multiple or lesta common deonominator fo 5 and 7. The answer is 35.

Now convert the fractions into those with a common denominator.

1/5 * 7/7 = 7/35

1/7 * 5/5 = 5/35

Now, (7+5) / 35 = 12/35, which is in simplest form.

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