You cannot add or subtract fractions with different denominators. If the denominators are different then you need to work with equivalent fractions.
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Subtracting a negative fraction is the same as adding its positive equivalent.
Subtracting a fraction is the same as adding its negative.
The Lowest Common Denominator is needed when adding or subtracting fractions.
you must make the fractions equivalent and with the same denomenator
Ensure that the denominators are the same when adding or subtracting fractions.