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The common denominator of the two fractions is: 75

$ \frac{11}{15 }= \frac{(5*11)}{(5*15)} =\frac{ 55}{75} $

$ \frac{18}{25 }= \frac{(3*18)}{(3*25)} =\frac{ 54}{75} $

Fractions adjusted to a common denominator

$ \frac{11}{15 }-\frac{ 18}{25 }=\frac{ 55}{75 }-\frac{ 54}{75} $

$ \frac{55}{75 }-\frac{ 54}{75 }= \frac{(55-54)}{75} $

$ \frac{(55-54)}{75 }=\frac{ 1}{75} $

$ $

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