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4.7: Add and Subtract Fractions with Common Denominators
https://math.libretexts.org/Courses/Grayson_College/Prealgebra/Book%3A_Prealgebra_(OpenStax)/04%3A_Fractions/4.07%3A_Add_and_Subtract_Fractions_with_Common_Denominators
To add fractions, add the numerators and place the sum over the common denominator. To subtract fractions, subtract the numerators and place the difference over the common denominator.

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