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The common denominator of the two fractions is: 28

$ \frac{19}{28 }= \frac{(1*19)}{(1*28)} =\frac{ 19}{28} $

$ \frac{4}{7 }= \frac{(4*4)}{(4*7)} =\frac{ 16}{28} $

Fractions adjusted to a common denominator

$ \frac{19}{28 }-\frac{ 4}{7 }=\frac{ 19}{28 }-\frac{ 16}{28} $

$ \frac{(19-16)}{28 }=\frac{ 3}{28} $

$ $

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