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The common denominator of the two fractions is: 75

$ \frac{7}{15 }= \frac{(5*7)}{(5*15)} =\frac{ 35}{75} $

$ \frac{3}{25 }= \frac{(3*3)}{(3*25)} =\frac{ 9}{75} $

Fractions adjusted to a common denominator

$ \frac{7}{15 }-\frac{ 3}{25 }=\frac{ 35}{75 }-\frac{ 9}{75} $

$ \frac{35}{75 }-\frac{ 9}{75 }= \frac{(35-9)}{75} $

$ \frac{(35-9)}{75 }=\frac{ 26}{75} $

$ $

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