When adding or subtracting fractions, they should have the same denominator. In this exercise, we have two fractions with different denominators.
32+21
Since both denominators are prime numbers, we have to multiply each fraction by the denominator of the other fraction. First we multiply the numerator and denominator of 32 by 2. Then we can do the same and multiply 21 by 3 to create a common denominator.
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