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{{ printedBook.courseTrack.name }} {{ printedBook.name }} If the numerator of a fraction is a sum it can be rewritten as sum of fractions. The denominator is the same, and the numerators are the terms in the sum of the original expression. $\dfrac{2+3}{7}=\dfrac{2}{7}+\dfrac{3}{7}.$ This is the same rule as when adding fractions, but the other way around.