The usual rules of addition of fractions apply.
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In fractions, you can NEVER add or subtract
Change them into mixed numbers and add the integers and fractions together ensuring that the fractions have a common denominator.
No.
Change them to like fractions and proceed.
Because you can't add or subtract fractions that have different denominators. Making them like fractions, by multiplying so the denominators are the same, you can add and/or subtract them.