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The common denominator of the two fractions is: 56

$ \frac{13}{56 }= \frac{(1*13)}{(1*56)} =\frac{ 13}{56} $

$ \frac{5}{7 }= \frac{(5*8)}{(7*8)} =\frac{ 40}{56} $

Fractions adjusted to a common denominator

$ \frac{13}{56 }+\frac{ 5}{7 }=\frac{ 13}{56 }+\frac{ 40}{56} $

$ \frac{(13+40)}{56 }=\frac{ 53}{56} $

$ $

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