How to add fractions with different denominators (ex. 2/3 + 1/5)

id 9620
user_id 6
roll_id 1364
order 8
language ja
description How to calculate 2/3 +1/5. If denominators are different, its should be the same with keeping the same value of fractions.
image_id 0
tag
created_time 1488511264
updated_time 1488511264

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