I need to know or put into words how to solve this

You have to take the least common multiple of the denominators. Express the fractions in common denominator. Then add/subtract etc.

For example 1/3+1/5 = 5/15+3/15 = (5+3)/15 =8/15

1/4-1/7 =7/28 -4/28 = (7-4)/28 =3/28

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